55440305145021 has 16 divisors (see below), whose sum is σ = 73961930746368. Its totient is φ = 36939446510400.

The previous prime is 55440305145019. The next prime is 55440305145031. The reversal of 55440305145021 is 12054150304455.

It is not a de Polignac number, because 55440305145021 - 2¹ = 55440305145019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55440305145031) 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, 43814451 + ... + 45062031.

It is an arithmetic number, because the mean of its divisors is an integer number (4622620671648).

Almost surely, 2^{55440305145021} is an apocalyptic number.

It is an amenable number.

55440305145021 is a deficient number, since it is larger than the sum of its proper divisors (18521625601347).

55440305145021 is a wasteful number, since it uses less digits than its factorization.

55440305145021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1255892.

The product of its (nonzero) digits is 240000, while the sum is 39.

Adding to 55440305145021 its reverse (12054150304455), we get a palindrome (67494455449476).

The spelling of 55440305145021 in words is "fifty-five trillion, four hundred forty billion, three hundred five million, one hundred forty-five thousand, twenty-one".