55520715021 has 16 divisors (see below), whose sum is σ = 80293949568. Its totient is φ = 33986854400.

The previous prime is 55520715011. The next prime is 55520715109. The reversal of 55520715021 is 12051702555.

55520715021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 55520715021 - 2¹⁵ = 55520682253 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55520715011) 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, 13274025 + ... + 13278206.

It is an arithmetic number, because the mean of its divisors is an integer number (5018371848).

Almost surely, 2^55520715021 is an apocalyptic number.

55520715021 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

55520715021 is a deficient number, since it is larger than the sum of its proper divisors (24773234547).

55520715021 is a wasteful number, since it uses less digits than its factorization.

55520715021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26552292.

The product of its (nonzero) digits is 17500, while the sum is 33.

The spelling of 55520715021 in words is "fifty-five billion, five hundred twenty million, seven hundred fifteen thousand, twenty-one".