1521215155452 has 12 divisors (see below), whose sum is σ = 3549502029416. Its totient is φ = 507071718480.

The previous prime is 1521215155451. The next prime is 1521215155501. The reversal of 1521215155452 is 2545515121251.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 1521215155452.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1521215155451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63383964799 + ... + 63383964822.

Almost surely, 2^{1521215155452} is an apocalyptic number.

1521215155452 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1521215155452 is an abundant number, since it is smaller than the sum of its proper divisors (2028286873964).

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

1521215155452 is a wasteful number, since it uses less digits than its factorization.

1521215155452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126767929628 (or 126767929626 counting only the distinct ones).

The product of its digits is 100000, while the sum is 39.

The spelling of 1521215155452 in words is "one trillion, five hundred twenty-one billion, two hundred fifteen million, one hundred fifty-five thousand, four hundred fifty-two".