21620610761615 has 8 divisors (see below), whose sum is σ = 26645941911840. Its totient is φ = 16829015944032.

The previous prime is 21620610761597. The next prime is 21620610761621. The reversal of 21620610761615 is 51616701602612.

It is a happy number.

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 21620610761615 - 2⁶ = 21620610761551 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58434082955 + ... + 58434083324.

It is an arithmetic number, because the mean of its divisors is an integer number (3330742738980).

Almost surely, 2^{21620610761615} is an apocalyptic number.

21620610761615 is a deficient number, since it is larger than the sum of its proper divisors (5025331150225).

21620610761615 is a wasteful number, since it uses less digits than its factorization.

21620610761615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116868166321.

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 21620610761615 in words is "twenty-one trillion, six hundred twenty billion, six hundred ten million, seven hundred sixty-one thousand, six hundred fifteen".