1211421210 has 16 divisors (see below), whose sum is σ = 2907410976. Its totient is φ = 323045648.

The previous prime is 1211421199. The next prime is 1211421227. The reversal of 1211421210 is 121241121.

It is a super-3 number, since 3×1211421210³ (a number of 28 digits) contains 333 as substring.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211421210.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20190324 + ... + 20190383.

It is an arithmetic number, because the mean of its divisors is an integer number (181713186).

Almost surely, 2^1211421210 is an apocalyptic number.

1211421210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211421210 is an abundant number, since it is smaller than the sum of its proper divisors (1695989766).

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

1211421210 is a wasteful number, since it uses less digits than its factorization.

1211421210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40380717.

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 1211421210 is about 34805.4767242168. The cubic root of 1211421210 is about 1066.0192758876.

Adding to 1211421210 its reverse (121241121), we get a palindrome (1332662331).

The spelling of 1211421210 in words is "one billion, two hundred eleven million, four hundred twenty-one thousand, two hundred ten".