21656611522 has 16 divisors (see below), whose sum is σ = 39981436992. Its totient is φ = 8567450640.

The previous prime is 21656611513. The next prime is 21656611523. The reversal of 21656611522 is 22511665612.

It is a super-2 number, since 2×21656611522² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21656611523) 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, 59496004 + ... + 59496367.

It is an arithmetic number, because the mean of its divisors is an integer number (2498839812).

Almost surely, 2^21656611522 is an apocalyptic number.

21656611522 is a deficient number, since it is larger than the sum of its proper divisors (18324825470).

21656611522 is a wasteful number, since it uses less digits than its factorization.

21656611522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118992393.

The product of its digits is 43200, while the sum is 37.

The spelling of 21656611522 in words is "twenty-one billion, six hundred fifty-six million, six hundred eleven thousand, five hundred twenty-two".