20216768621 has 16 divisors (see below), whose sum is σ = 23393071104. Its totient is φ = 17113436784.

The previous prime is 20216768617. The next prime is 20216768623. The reversal of 20216768621 is 12686761202.

It is a cyclic number.

It is not a de Polignac number, because 20216768621 - 2² = 20216768617 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 (20216768623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 226406 + ... + 302808.

It is an arithmetic number, because the mean of its divisors is an integer number (1462066944).

Almost surely, 2^20216768621 is an apocalyptic number.

It is an amenable number.

20216768621 is a deficient number, since it is larger than the sum of its proper divisors (3176302483).

20216768621 is a wasteful number, since it uses less digits than its factorization.

20216768621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76880.

The product of its (nonzero) digits is 96768, while the sum is 41.

The spelling of 20216768621 in words is "twenty billion, two hundred sixteen million, seven hundred sixty-eight thousand, six hundred twenty-one".