121313231010 has 40 divisors (see below), whose sum is σ = 326197801116. Its totient is φ = 32350194720.

The previous prime is 121313230939. The next prime is 121313231051. The reversal of 121313231010 is 10132313121.

121313231010 is a `hidden beast` number, since 1 + 213 + 132 + 310 + 10 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 118266522201 + 3046708809 = 343899^2 + 55197^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 74883901 + ... + 74885520.

Almost surely, 2^121313231010 is an apocalyptic number.

121313231010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121313231010 is an abundant number, since it is smaller than the sum of its proper divisors (204884570106).

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

121313231010 is a wasteful number, since it uses less digits than its factorization.

121313231010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149769440 (or 149769431 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 121313231010 its reverse (10132313121), we get a palindrome (131445544131).

The spelling of 121313231010 in words is "one hundred twenty-one billion, three hundred thirteen million, two hundred thirty-one thousand, ten".