21574854456 has 16 divisors (see below), whose sum is σ = 53937136200. Its totient is φ = 7191618144.

The previous prime is 21574854449. The next prime is 21574854463. The reversal of 21574854456 is 65445847512.

It is an interprime number because it is at equal distance from previous prime (21574854449) and next prime (21574854463).

It is a junction number, because it is equal to n+sod(n) for n = 21574854399 and 21574854408.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 449476111 + ... + 449476158.

Almost surely, 2^21574854456 is an apocalyptic number.

It is an amenable number.

21574854456 is an abundant number, since it is smaller than the sum of its proper divisors (32362281744).

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

21574854456 is a wasteful number, since it uses less digits than its factorization.

21574854456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898952278 (or 898952274 counting only the distinct ones).

The product of its digits is 5376000, while the sum is 51.

The spelling of 21574854456 in words is "twenty-one billion, five hundred seventy-four million, eight hundred fifty-four thousand, four hundred fifty-six".