55215671121 has 12 divisors (see below), whose sum is σ = 85891044148. Its totient is φ = 33978874464.

The previous prime is 55215671099. The next prime is 55215671123. The reversal of 55215671121 is 12117651255.

55215671121 is a `hidden beast` number, since 5 + 521 + 5 + 6 + 7 + 1 + 121 = 666.

55215671121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 15668780625 + 39546890496 = 125175^2 + 198864^2 .

It is not a de Polignac number, because 55215671121 - 2⁵ = 55215671089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55215671123) 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, 235964290 + ... + 235964523.

Almost surely, 2^55215671121 is an apocalyptic number.

It is an amenable number.

55215671121 is a deficient number, since it is larger than the sum of its proper divisors (30675373027).

55215671121 is a wasteful number, since it uses less digits than its factorization.

55215671121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471928832 (or 471928829 counting only the distinct ones).

The product of its digits is 21000, while the sum is 36.

The spelling of 55215671121 in words is "fifty-five billion, two hundred fifteen million, six hundred seventy-one thousand, one hundred twenty-one".