1212321210 has 64 divisors (see below), whose sum is σ = 2992356864. Its totient is φ = 314150400.

The previous prime is 1212321193. The next prime is 1212321233. The reversal of 1212321210 is 121232121.

1212321210 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 1212321210.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 331512 + ... + 335148.

It is an arithmetic number, because the mean of its divisors is an integer number (46755576).

Almost surely, 2^1212321210 is an apocalyptic number.

1212321210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212321210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1496178432).

1212321210 is an abundant number, since it is smaller than the sum of its proper divisors (1780035654).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1212321210 is a wasteful number, since it uses less digits than its factorization.

1212321210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3959.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1212321210 is about 34818.4033235299. The cubic root of 1212321210 is about 1066.2832027655.

Adding to 1212321210 its reverse (121232121), we get a palindrome (1333553331).

It can be divided in two parts, 12123 and 21210, that added together give a palindrome (33333).

The spelling of 1212321210 in words is "one billion, two hundred twelve million, three hundred twenty-one thousand, two hundred ten".