21715960627658 has 16 divisors (see below), whose sum is σ = 35603153267616. Its totient is φ = 9852017592240.

The previous prime is 21715960627657. The next prime is 21715960627709. The reversal of 21715960627658 is 85672606951712.

It is a junction number, because it is equal to n+sod(n) for n = 21715960627594 and 21715960627603.

It is not an unprimeable number, because it can be changed into a prime (21715960627657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 943668341 + ... + 943691352.

It is an arithmetic number, because the mean of its divisors is an integer number (2225197079226).

Almost surely, 2^{21715960627658} is an apocalyptic number.

21715960627658 is a deficient number, since it is larger than the sum of its proper divisors (13887192639958).

21715960627658 is a wasteful number, since it uses less digits than its factorization.

21715960627658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1887360229.

The product of its (nonzero) digits is 76204800, while the sum is 65.

The spelling of 21715960627658 in words is "twenty-one trillion, seven hundred fifteen billion, nine hundred sixty million, six hundred twenty-seven thousand, six hundred fifty-eight".