21577464366 has 32 divisors (see below), whose sum is σ = 43452920448. Its totient is φ = 7142891040.

The previous prime is 21577464313. The next prime is 21577464373. The reversal of 21577464366 is 66346477512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1387876 + ... + 1403336.

It is an arithmetic number, because the mean of its divisors is an integer number (1357903764).

Almost surely, 2^21577464366 is an apocalyptic number.

21577464366 is an abundant number, since it is smaller than the sum of its proper divisors (21875456082).

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

21577464366 is a wasteful number, since it uses less digits than its factorization.

21577464366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17056.

The product of its digits is 5080320, while the sum is 51.

The spelling of 21577464366 in words is "twenty-one billion, five hundred seventy-seven million, four hundred sixty-four thousand, three hundred sixty-six".