55212221215 has 16 divisors (see below), whose sum is σ = 68068260000. Its totient is φ = 42961518720.

The previous prime is 55212221179. The next prime is 55212221227. The reversal of 55212221215 is 51212221255.

It is a de Polignac number, because none of the positive numbers 2^k-55212221215 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 517536 + ... + 615034.

It is an arithmetic number, because the mean of its divisors is an integer number (4254266250).

Almost surely, 2^55212221215 is an apocalyptic number.

55212221215 is a deficient number, since it is larger than the sum of its proper divisors (12856038785).

55212221215 is a wasteful number, since it uses less digits than its factorization.

55212221215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100602.

The product of its digits is 4000, while the sum is 28.

The spelling of 55212221215 in words is "fifty-five billion, two hundred twelve million, two hundred twenty-one thousand, two hundred fifteen".