21056126315 has 32 divisors (see below), whose sum is σ = 29676764544. Its totient is φ = 14039101440.

The previous prime is 21056126281. The next prime is 21056126347. The reversal of 21056126315 is 51362165012.

It is not a de Polignac number, because 21056126315 - 2¹⁰ = 21056125291 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2405627 + ... + 2414363.

It is an arithmetic number, because the mean of its divisors is an integer number (927398892).

Almost surely, 2^21056126315 is an apocalyptic number.

21056126315 is a deficient number, since it is larger than the sum of its proper divisors (8620638229).

21056126315 is a wasteful number, since it uses less digits than its factorization.

21056126315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10647.

The product of its (nonzero) digits is 10800, while the sum is 32.

The spelling of 21056126315 in words is "twenty-one billion, fifty-six million, one hundred twenty-six thousand, three hundred fifteen".