55996421 has 16 divisors (see below), whose sum is σ = 63431424. Its totient is φ = 49044864.

The previous prime is 55996403. The next prime is 55996433. The reversal of 55996421 is 12469955.

It is a cyclic number.

It is not a de Polignac number, because 55996421 - 2¹⁴ = 55980037 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55996471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40280 + ... + 41646.

It is an arithmetic number, because the mean of its divisors is an integer number (3964464).

Almost surely, 2^55996421 is an apocalyptic number.

It is an amenable number.

55996421 is a deficient number, since it is larger than the sum of its proper divisors (7435003).

55996421 is a wasteful number, since it uses less digits than its factorization.

55996421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1540.

The product of its digits is 97200, while the sum is 41.

The square root of 55996421 is about 7483.0756377308. The cubic root of 55996421 is about 382.5780859276.

The spelling of 55996421 in words is "fifty-five million, nine hundred ninety-six thousand, four hundred twenty-one".