1212221010 has 256 divisors, whose sum is σ = 4015484928. Its totient is φ = 226022400.

The previous prime is 1212220987. The next prime is 1212221011. The reversal of 1212221010 is 101222121.

It is not an unprimeable number, because it can be changed into a prime (1212221011) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1110565 + ... + 1111655.

It is an arithmetic number, because the mean of its divisors is an integer number (15685488).

Almost surely, 2^1212221010 is an apocalyptic number.

1212221010 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 1212221010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2007742464).

1212221010 is an abundant number, since it is smaller than the sum of its proper divisors (2803263918).

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

1212221010 is a wasteful number, since it uses less digits than its factorization.

1212221010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1169.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1212221010 is about 34816.9643995567. The cubic root of 1212221010 is about 1066.2538253696.

Adding to 1212221010 its reverse (101222121), we get a palindrome (1313443131).

It can be divided in two parts, 1212 and 221010, that added together give a palindrome (222222).

The spelling of 1212221010 in words is "one billion, two hundred twelve million, two hundred twenty-one thousand, ten".