21404543770564 has 6 divisors (see below), whose sum is σ = 37457951598494. Its totient is φ = 10702271885280.

The previous prime is 21404543770517. The next prime is 21404543770613. The reversal of 21404543770564 is 46507734540412.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20220490758400 + 1184053012164 = 4496720^2 + 1088142^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2675567971317 + ... + 2675567971324.

Almost surely, 2^{21404543770564} is an apocalyptic number.

It is an amenable number.

21404543770564 is a deficient number, since it is larger than the sum of its proper divisors (16053407827930).

21404543770564 is a wasteful number, since it uses less digits than its factorization.

21404543770564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5351135942645 (or 5351135942643 counting only the distinct ones).

The product of its (nonzero) digits is 11289600, while the sum is 52.

The spelling of 21404543770564 in words is "twenty-one trillion, four hundred four billion, five hundred forty-three million, seven hundred seventy thousand, five hundred sixty-four".