55856421 has 24 divisors (see below), whose sum is σ = 84296160. Its totient is φ = 35604576.

The previous prime is 55856401. The next prime is 55856429. The reversal of 55856421 is 12465855.

55856421 is a `hidden beast` number, since 5 + 5 + 8 + 5 + 642 + 1 = 666.

It is not a de Polignac number, because 55856421 - 2⁶ = 55856357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55856429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18226 + ... + 21068.

It is an arithmetic number, because the mean of its divisors is an integer number (3512340).

Almost surely, 2^55856421 is an apocalyptic number.

It is an amenable number.

55856421 is a deficient number, since it is larger than the sum of its proper divisors (28439739).

55856421 is a wasteful number, since it uses less digits than its factorization.

55856421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2945 (or 2942 counting only the distinct ones).

The product of its digits is 48000, while the sum is 36.

The square root of 55856421 is about 7473.7153411138. The cubic root of 55856421 is about 382.2589843961.

The spelling of 55856421 in words is "fifty-five million, eight hundred fifty-six thousand, four hundred twenty-one".