21656022014 has 32 divisors (see below), whose sum is σ = 35770572000. Its totient is φ = 9751436800.

The previous prime is 21656021987. The next prime is 21656022043. The reversal of 21656022014 is 41022065612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1059362 + ... + 1079610.

It is an arithmetic number, because the mean of its divisors is an integer number (1117830375).

Almost surely, 2^21656022014 is an apocalyptic number.

21656022014 is a deficient number, since it is larger than the sum of its proper divisors (14114549986).

21656022014 is a wasteful number, since it uses less digits than its factorization.

21656022014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20716.

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 21656022014 its reverse (41022065612), we get a palindrome (62678087626).

The spelling of 21656022014 in words is "twenty-one billion, six hundred fifty-six million, twenty-two thousand, fourteen".