121211220010 has 16 divisors (see below), whose sum is σ = 218199883176. Its totient is φ = 48480113088.

The previous prime is 121211220007. The next prime is 121211220017. The reversal of 121211220010 is 10022112121.

It can be written as a sum of positive squares in 4 ways, for example, as 38123734009 + 83087486001 = 195253^2 + 288249^2 .

It is not an unprimeable number, because it can be changed into a prime (121211220017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 429297 + ... + 653236.

Almost surely, 2^121211220010 is an apocalyptic number.

121211220010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121211220010 is a deficient number, since it is larger than the sum of its proper divisors (96988663166).

121211220010 is a wasteful number, since it uses less digits than its factorization.

121211220010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093737.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121211220010 its reverse (10022112121), we get a palindrome (131233332131).

The spelling of 121211220010 in words is "one hundred twenty-one billion, two hundred eleven million, two hundred twenty thousand, ten".