121395681522 has 12 divisors (see below), whose sum is σ = 263023976670. Its totient is φ = 40465227168.

The previous prime is 121395681509. The next prime is 121395681523. The reversal of 121395681522 is 225186593121.

121395681522 is a `hidden beast` number, since 1 + 2 + 1 + 39 + 568 + 1 + 52 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 116375817321 + 5019864201 = 341139^2 + 70851^2 .

It is a super-2 number, since 2×121395681522² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121395681523) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3372102247 + ... + 3372102282.

Almost surely, 2^121395681522 is an apocalyptic number.

121395681522 is an abundant number, since it is smaller than the sum of its proper divisors (141628295148).

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

121395681522 is a wasteful number, since it uses less digits than its factorization.

121395681522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6744204537 (or 6744204534 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The spelling of 121395681522 in words is "one hundred twenty-one billion, three hundred ninety-five million, six hundred eighty-one thousand, five hundred twenty-two".