21054035015 has 16 divisors (see below), whose sum is σ = 27654334176. Its totient is φ = 15292713600.

The previous prime is 21054034993. The next prime is 21054035039. The reversal of 21054035015 is 51053045012.

It is not a de Polignac number, because 21054035015 - 2⁶ = 21054034951 is a prime.

It is a Duffinian 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, 2651021 + ... + 2658950.

It is an arithmetic number, because the mean of its divisors is an integer number (1728395886).

Almost surely, 2^21054035015 is an apocalyptic number.

21054035015 is a deficient number, since it is larger than the sum of its proper divisors (6600299161).

21054035015 is a wasteful number, since it uses less digits than its factorization.

21054035015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5310050.

The product of its (nonzero) digits is 3000, while the sum is 26.

The spelling of 21054035015 in words is "twenty-one billion, fifty-four million, thirty-five thousand, fifteen".