21275556654 has 16 divisors (see below), whose sum is σ = 46419396480. Its totient is φ = 6447138360.

The previous prime is 21275556583. The next prime is 21275556677. The reversal of 21275556654 is 45665557212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161178394 + ... + 161178525.

It is an arithmetic number, because the mean of its divisors is an integer number (2901212280).

Almost surely, 2^21275556654 is an apocalyptic number.

21275556654 is an abundant number, since it is smaller than the sum of its proper divisors (25143839826).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21275556654 is a wasteful number, since it uses less digits than its factorization.

21275556654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322356935.

The product of its digits is 2520000, while the sum is 48.

The spelling of 21275556654 in words is "twenty-one billion, two hundred seventy-five million, five hundred fifty-six thousand, six hundred fifty-four".