221231253055515 has 16 divisors (see below), whose sum is σ = 353971017538848. Its totient is φ = 117989664079616.

The previous prime is 221231253055511. The next prime is 221231253055541. The reversal of 221231253055515 is 515550352132122.

It is a cyclic number.

It is not a de Polignac number, because 221231253055515 - 2² = 221231253055511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221231253055511) 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, 15633234 + ... + 26208023.

It is an arithmetic number, because the mean of its divisors is an integer number (22123188596178).

Almost surely, 2^{221231253055515} is an apocalyptic number.

221231253055515 is a deficient number, since it is larger than the sum of its proper divisors (132739764483333).

221231253055515 is a wasteful number, since it uses less digits than its factorization.

221231253055515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42193758.

The product of its (nonzero) digits is 450000, while the sum is 42.

The spelling of 221231253055515 in words is "two hundred twenty-one trillion, two hundred thirty-one billion, two hundred fifty-three million, fifty-five thousand, five hundred fifteen".