21601622055 has 32 divisors (see below), whose sum is σ = 37244680704. Its totient is φ = 10627952256.

The previous prime is 21601622041. The next prime is 21601622069. The reversal of 21601622055 is 55022610612.

It is an interprime number because it is at equal distance from previous prime (21601622041) and next prime (21601622069).

It is not a de Polignac number, because 21601622055 - 2¹³ = 21601613863 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 283222 + ... + 351308.

It is an arithmetic number, because the mean of its divisors is an integer number (1163896272).

Almost surely, 2^21601622055 is an apocalyptic number.

21601622055 is a deficient number, since it is larger than the sum of its proper divisors (15643058649).

21601622055 is a wasteful number, since it uses less digits than its factorization.

21601622055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69735.

The product of its (nonzero) digits is 7200, while the sum is 30.

The spelling of 21601622055 in words is "twenty-one billion, six hundred one million, six hundred twenty-two thousand, fifty-five".