55919421 has 24 divisors (see below), whose sum is σ = 82255680. Its totient is φ = 36602496.

The previous prime is 55919419. The next prime is 55919441. The reversal of 55919421 is 12491955.

It is not a de Polignac number, because 55919421 - 2¹ = 55919419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55919401) 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, 165765 + ... + 166101.

It is an arithmetic number, because the mean of its divisors is an integer number (3427320).

Almost surely, 2^55919421 is an apocalyptic number.

It is an amenable number.

55919421 is a deficient number, since it is larger than the sum of its proper divisors (26336259).

55919421 is a wasteful number, since it uses less digits than its factorization.

55919421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625 (or 622 counting only the distinct ones).

The product of its digits is 16200, while the sum is 36.

The square root of 55919421 is about 7477.9289245084. The cubic root of 55919421 is about 382.4026459912.

The spelling of 55919421 in words is "fifty-five million, nine hundred nineteen thousand, four hundred twenty-one".