21544653376 has 28 divisors (see below), whose sum is σ = 43167759232. Its totient is φ = 10667737728.

The previous prime is 21544653359. The next prime is 21544653461. The reversal of 21544653376 is 67335644512.

It is a happy 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, 1627560 + ... + 1640743.

Almost surely, 2^21544653376 is an apocalyptic number.

It is an amenable number.

21544653376 is an abundant number, since it is smaller than the sum of its proper divisors (21623105856).

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

21544653376 is a wasteful number, since it uses less digits than its factorization.

21544653376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3268418 (or 3268408 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 46.

The spelling of 21544653376 in words is "twenty-one billion, five hundred forty-four million, six hundred fifty-three thousand, three hundred seventy-six".