21655234664014 has 16 divisors (see below), whose sum is σ = 37483679420928. Its totient is φ = 9190709856792.

The previous prime is 21655234664003. The next prime is 21655234664023. The reversal of 21655234664014 is 41046643255612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7508748442 + ... + 7508751325.

It is an arithmetic number, because the mean of its divisors is an integer number (2342729963808).

Almost surely, 2^{21655234664014} is an apocalyptic number.

21655234664014 is a deficient number, since it is larger than the sum of its proper divisors (15828444756914).

21655234664014 is a wasteful number, since it uses less digits than its factorization.

21655234664014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15017499879.

The product of its (nonzero) digits is 4147200, while the sum is 49.

The spelling of 21655234664014 in words is "twenty-one trillion, six hundred fifty-five billion, two hundred thirty-four million, six hundred sixty-four thousand, fourteen".