21614556806 has 32 divisors (see below), whose sum is σ = 34643052000. Its totient is φ = 10113908736.

The previous prime is 21614556781. The next prime is 21614556869. The reversal of 21614556806 is 60865541612.

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, 1752710 + ... + 1764998.

It is an arithmetic number, because the mean of its divisors is an integer number (1082595375).

Almost surely, 2^21614556806 is an apocalyptic number.

21614556806 is a deficient number, since it is larger than the sum of its proper divisors (13028495194).

21614556806 is a wasteful number, since it uses less digits than its factorization.

21614556806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12521 (or 12487 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 44.

The spelling of 21614556806 in words is "twenty-one billion, six hundred fourteen million, five hundred fifty-six thousand, eight hundred six".