21406600552 has 8 divisors (see below), whose sum is σ = 40137376050. Its totient is φ = 10703300272.

The previous prime is 21406600547. The next prime is 21406600561. The reversal of 21406600552 is 25500660412.

It can be written as a sum of positive squares in only one way, i.e., 21151048356 + 255552196 = 145434^2 + 15986^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1337912527 + ... + 1337912542.

Almost surely, 2^21406600552 is an apocalyptic number.

It is an amenable number.

21406600552 is a deficient number, since it is larger than the sum of its proper divisors (18730775498).

21406600552 is a wasteful number, since it uses less digits than its factorization.

21406600552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2675825075 (or 2675825071 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The spelling of 21406600552 in words is "twenty-one billion, four hundred six million, six hundred thousand, five hundred fifty-two".