55421445 has 16 divisors (see below), whose sum is σ = 93890880. Its totient is φ = 27819264.

The previous prime is 55421441. The next prime is 55421477. The reversal of 55421445 is 54412455.

It is not a de Polignac number, because 55421445 - 2² = 55421441 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55421441) 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, 108415 + ... + 108924.

It is an arithmetic number, because the mean of its divisors is an integer number (5868180).

Almost surely, 2^55421445 is an apocalyptic number.

It is an amenable number.

55421445 is a deficient number, since it is larger than the sum of its proper divisors (38469435).

55421445 is a wasteful number, since it uses less digits than its factorization.

55421445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217364.

The product of its digits is 16000, while the sum is 30.

The square root of 55421445 is about 7444.5580795639. The cubic root of 55421445 is about 381.2641302655.

The spelling of 55421445 in words is "fifty-five million, four hundred twenty-one thousand, four hundred forty-five".