21051152515500 has 96 divisors (see below), whose sum is σ = 61302261017088. Its totient is φ = 5613521176000.

The previous prime is 21051152515493. The next prime is 21051152515537. The reversal of 21051152515500 is 551525115012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87466327 + ... + 87706673.

It is an arithmetic number, because the mean of its divisors is an integer number (638565218928).

Almost surely, 2^{21051152515500} is an apocalyptic number.

21051152515500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21051152515500 is an abundant number, since it is smaller than the sum of its proper divisors (40251108501588).

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

21051152515500 is a wasteful number, since it uses less digits than its factorization.

21051152515500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298760 (or 298748 counting only the distinct ones).

The product of its (nonzero) digits is 12500, while the sum is 33.

The spelling of 21051152515500 in words is "twenty-one trillion, fifty-one billion, one hundred fifty-two million, five hundred fifteen thousand, five hundred".