21572606654 has 8 divisors (see below), whose sum is σ = 34262375328. Its totient is φ = 10151814880.

The previous prime is 21572606641. The next prime is 21572606663. The reversal of 21572606654 is 45660627512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317244182 + ... + 317244249.

It is an arithmetic number, because the mean of its divisors is an integer number (4282796916).

Almost surely, 2^21572606654 is an apocalyptic number.

21572606654 is a deficient number, since it is larger than the sum of its proper divisors (12689768674).

21572606654 is a wasteful number, since it uses less digits than its factorization.

21572606654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634488450.

The product of its (nonzero) digits is 604800, while the sum is 44.

The spelling of 21572606654 in words is "twenty-one billion, five hundred seventy-two million, six hundred six thousand, six hundred fifty-four".