21655364002613 has 32 divisors (see below), whose sum is σ = 24808232171520. Its totient is φ = 18710855760960.

The previous prime is 21655364002543. The next prime is 21655364002687. The reversal of 21655364002613 is 31620046355612.

It is not a de Polignac number, because 21655364002613 - 2³² = 21651069035317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21655364002513) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 112249031 + ... + 112441787.

It is an arithmetic number, because the mean of its divisors is an integer number (775257255360).

Almost surely, 2^{21655364002613} is an apocalyptic number.

21655364002613 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21655364002613 is a deficient number, since it is larger than the sum of its proper divisors (3152868168907).

21655364002613 is a wasteful number, since it uses less digits than its factorization.

21655364002613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195617.

The product of its (nonzero) digits is 777600, while the sum is 44.

The spelling of 21655364002613 in words is "twenty-one trillion, six hundred fifty-five billion, three hundred sixty-four million, two thousand, six hundred thirteen".