221215550055156 has 72 divisors (see below), whose sum is σ = 559372120411104. Its totient is φ = 73713681040320.

The previous prime is 221215550055121. The next prime is 221215550055173. The reversal of 221215550055156 is 651550055512122.

221215550055156 is a `hidden beast` number, since 2 + 2 + 121 + 5 + 5 + 5 + 0 + 0 + 5 + 515 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1358294226 + ... + 1358457078.

It is an arithmetic number, because the mean of its divisors is an integer number (7769057227932).

Almost surely, 2^{221215550055156} is an apocalyptic number.

It is an amenable number.

221215550055156 is an abundant number, since it is smaller than the sum of its proper divisors (338156570355948).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221215550055156 is a wasteful number, since it uses less digits than its factorization.

221215550055156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175341 (or 175336 counting only the distinct ones).

The product of its (nonzero) digits is 750000, while the sum is 45.

The spelling of 221215550055156 in words is "two hundred twenty-one trillion, two hundred fifteen billion, five hundred fifty million, fifty-five thousand, one hundred fifty-six".