55805134045021 has 16 divisors (see below), whose sum is σ = 59576952504960. Its totient is φ = 52116969965760.

The previous prime is 55805134045019. The next prime is 55805134045051. The reversal of 55805134045021 is 12054043150855.

It is a cyclic number.

It is not a de Polignac number, because 55805134045021 - 2¹ = 55805134045019 is a prime.

It is a super-2 number, since 2×55805134045021² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55805134045051) 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, 8401615 + ... + 13498051.

It is an arithmetic number, because the mean of its divisors is an integer number (3723559531560).

Almost surely, 2^{55805134045021} is an apocalyptic number.

It is an amenable number.

55805134045021 is a deficient number, since it is larger than the sum of its proper divisors (3771818459939).

55805134045021 is a wasteful number, since it uses less digits than its factorization.

55805134045021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5104644.

The product of its (nonzero) digits is 480000, while the sum is 43.

Adding to 55805134045021 its reverse (12054043150855), we get a palindrome (67859177195876).

The spelling of 55805134045021 in words is "fifty-five trillion, eight hundred five billion, one hundred thirty-four million, forty-five thousand, twenty-one".