55982421 has 40 divisors (see below), whose sum is σ = 92451744. Its totient is φ = 33475680.

The previous prime is 55982413. The next prime is 55982467. The reversal of 55982421 is 12428955.

55982421 is a `hidden beast` number, since 559 + 82 + 4 + 21 = 666.

It is not a de Polignac number, because 55982421 - 2³ = 55982413 is a prime.

It is a super-2 number, since 2×55982421² = 6268062922042482, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55982401) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 73575 + ... + 74331.

Almost surely, 2^55982421 is an apocalyptic number.

It is an amenable number.

55982421 is a deficient number, since it is larger than the sum of its proper divisors (36469323).

55982421 is a wasteful number, since it uses less digits than its factorization.

55982421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863 (or 854 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 55982421 is about 7482.1401350148. The cubic root of 55982421 is about 382.5461997253.

The spelling of 55982421 in words is "fifty-five million, nine hundred eighty-two thousand, four hundred twenty-one".