21152515402560 has 112 divisors (see below), whose sum is σ = 70079203276416. Its totient is φ = 5395424212992.

The previous prime is 21152515402553. The next prime is 21152515402651. The reversal of 21152515402560 is 6520451525112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 478975099 + ... + 479019258.

Almost surely, 2^{21152515402560} is an apocalyptic number.

21152515402560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21152515402560 is an abundant number, since it is smaller than the sum of its proper divisors (48926687873856).

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

21152515402560 is a wasteful number, since it uses less digits than its factorization.

21152515402560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957994400 (or 957994390 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 39.

Adding to 21152515402560 its reverse (6520451525112), we get a palindrome (27672966927672).

The spelling of 21152515402560 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred fifteen million, four hundred two thousand, five hundred sixty".