21601622054 has 4 divisors (see below), whose sum is σ = 32402433084. Its totient is φ = 10800811026.

The previous prime is 21601622041. The next prime is 21601622069. The reversal of 21601622054 is 45022610612.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5400405512 + ... + 5400405515.

It is an arithmetic number, because the mean of its divisors is an integer number (8100608271).

Almost surely, 2^21601622054 is an apocalyptic number.

21601622054 is a deficient number, since it is larger than the sum of its proper divisors (10800811030).

21601622054 is a wasteful number, since it uses less digits than its factorization.

21601622054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10800811029.

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

The spelling of 21601622054 in words is "twenty-one billion, six hundred one million, six hundred twenty-two thousand, fifty-four".