21072115011015 has 24 divisors (see below), whose sum is σ = 36525112941408. Its totient is φ = 11238426388800.

The previous prime is 21072115010977. The next prime is 21072115011047. The reversal of 21072115011015 is 51011051127012.

It is not a de Polignac number, because 21072115011015 - 2²⁰ = 21072113962439 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21072115011015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21080790 + ... + 22057740.

It is an arithmetic number, because the mean of its divisors is an integer number (1521879705892).

Almost surely, 2^{21072115011015} is an apocalyptic number.

21072115011015 is a deficient number, since it is larger than the sum of its proper divisors (15452997930393).

21072115011015 is a wasteful number, since it uses less digits than its factorization.

21072115011015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1456279 (or 1456276 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 27.

Adding to 21072115011015 its reverse (51011051127012), we get a palindrome (72083166138027).

The spelling of 21072115011015 in words is "twenty-one trillion, seventy-two billion, one hundred fifteen million, eleven thousand, fifteen".