21620636211 has 8 divisors (see below), whose sum is σ = 28879272144. Its totient is φ = 14387878880.

The previous prime is 21620636179. The next prime is 21620636251. The reversal of 21620636211 is 11263602612.

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 21620636211 - 2⁵ = 21620636179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21620636251) 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, 6467700 + ... + 6471041.

It is an arithmetic number, because the mean of its divisors is an integer number (3609909018).

Almost surely, 2^21620636211 is an apocalyptic number.

21620636211 is a deficient number, since it is larger than the sum of its proper divisors (7258635933).

21620636211 is a wasteful number, since it uses less digits than its factorization.

21620636211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12939301.

The product of its (nonzero) digits is 5184, while the sum is 30.

The spelling of 21620636211 in words is "twenty-one billion, six hundred twenty million, six hundred thirty-six thousand, two hundred eleven".