55442013021 has 12 divisors (see below), whose sum is σ = 80094312480. Its totient is φ = 36956078280.

The previous prime is 55442013019. The next prime is 55442013049. The reversal of 55442013021 is 12031024455.

It is not a de Polignac number, because 55442013021 - 2¹ = 55442013019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55442011021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 371395 + ... + 498816.

It is an arithmetic number, because the mean of its divisors is an integer number (6674526040).

Almost surely, 2^55442013021 is an apocalyptic number.

It is an amenable number.

55442013021 is a deficient number, since it is larger than the sum of its proper divisors (24652299459).

55442013021 is a wasteful number, since it uses less digits than its factorization.

55442013021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 877296 (or 877293 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 55442013021 its reverse (12031024455), we get a palindrome (67473037476).

The spelling of 55442013021 in words is "fifty-five billion, four hundred forty-two million, thirteen thousand, twenty-one".