21621224565413 has 8 divisors (see below), whose sum is σ = 23870968634016. Its totient is φ = 19418843530000.

The previous prime is 21621224565383. The next prime is 21621224565503. The reversal of 21621224565413 is 31456542212612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21621224565413 - 2¹⁸ = 21621224303269 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 (21621224565613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11840757338 + ... + 11840759163.

It is an arithmetic number, because the mean of its divisors is an integer number (2983871079252).

Almost surely, 2^{21621224565413} is an apocalyptic number.

It is an amenable number.

21621224565413 is a deficient number, since it is larger than the sum of its proper divisors (2249744068603).

21621224565413 is a wasteful number, since it uses less digits than its factorization.

21621224565413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23681516595.

The product of its digits is 691200, while the sum is 44.

The spelling of 21621224565413 in words is "twenty-one trillion, six hundred twenty-one billion, two hundred twenty-four million, five hundred sixty-five thousand, four hundred thirteen".