55421922 has 32 divisors (see below), whose sum is σ = 113319360. Its totient is φ = 18066240.

The previous prime is 55421909. The next prime is 55421923. The reversal of 55421922 is 22912455.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 55421922.

It is not an unprimeable number, because it can be changed into a prime (55421923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53772 + ... + 54792.

It is an arithmetic number, because the mean of its divisors is an integer number (3541230).

Almost surely, 2^55421922 is an apocalyptic number.

55421922 is an abundant number, since it is smaller than the sum of its proper divisors (57897438).

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

55421922 is a wasteful number, since it uses less digits than its factorization.

55421922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1218.

The product of its digits is 7200, while the sum is 30.

The square root of 55421922 is about 7444.5901163194. The cubic root of 55421922 is about 381.2652240808.

The spelling of 55421922 in words is "fifty-five million, four hundred twenty-one thousand, nine hundred twenty-two".