21436465556 has 24 divisors (see below), whose sum is σ = 40967730720. Its totient is φ = 9733474400.

The previous prime is 21436465481. The next prime is 21436465577. The reversal of 21436465556 is 65556463412.

It is a self number, because there is not a number n which added to its sum of digits gives 21436465556.

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, 217466 + ... + 300273.

It is an arithmetic number, because the mean of its divisors is an integer number (1706988780).

Almost surely, 2^21436465556 is an apocalyptic number.

It is an amenable number.

21436465556 is a deficient number, since it is larger than the sum of its proper divisors (19531265164).

21436465556 is a wasteful number, since it uses less digits than its factorization.

21436465556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518695 (or 518693 counting only the distinct ones).

The product of its digits is 2592000, while the sum is 47.

The spelling of 21436465556 in words is "twenty-one billion, four hundred thirty-six million, four hundred sixty-five thousand, five hundred fifty-six".