21620624206364 has 12 divisors (see below), whose sum is σ = 38086662510288. Its totient is φ = 10738720632000.

The previous prime is 21620624206319. The next prime is 21620624206381. The reversal of 21620624206364 is 46360242602612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17897867117 + ... + 17897868324.

It is an arithmetic number, because the mean of its divisors is an integer number (3173888542524).

Almost surely, 2^{21620624206364} is an apocalyptic number.

It is an amenable number.

21620624206364 is a deficient number, since it is larger than the sum of its proper divisors (16466038303924).

21620624206364 is a wasteful number, since it uses less digits than its factorization.

21620624206364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35795735596 (or 35795735594 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 44.

Adding to 21620624206364 its reverse (46360242602612), we get a palindrome (67980866808976).

The spelling of 21620624206364 in words is "twenty-one trillion, six hundred twenty billion, six hundred twenty-four million, two hundred six thousand, three hundred sixty-four".