21640222221616 has 10 divisors (see below), whose sum is σ = 41927930554412. Its totient is φ = 10820111110800.

The previous prime is 21640222221587. The next prime is 21640222221617. The reversal of 21640222221616 is 61612222204612.

It is not an unprimeable number, because it can be changed into a prime (21640222221617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 676256944410 + ... + 676256944441.

Almost surely, 2^{21640222221616} is an apocalyptic number.

It is an amenable number.

21640222221616 is a deficient number, since it is larger than the sum of its proper divisors (20287708332796).

21640222221616 is a wasteful number, since it uses less digits than its factorization.

21640222221616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1352513888859 (or 1352513888853 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 37.

The spelling of 21640222221616 in words is "twenty-one trillion, six hundred forty billion, two hundred twenty-two million, two hundred twenty-one thousand, six hundred sixteen".