221921111124172 has 12 divisors (see below), whose sum is σ = 388558782770256. Its totient is φ = 110904316046960.

The previous prime is 221921111124169. The next prime is 221921111124173. The reversal of 221921111124172 is 271421111129122.

221921111124172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (221921111124173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14059869904 + ... + 14059885687.

It is an arithmetic number, because the mean of its divisors is an integer number (32379898564188).

Almost surely, 2^{221921111124172} is an apocalyptic number.

It is an amenable number.

221921111124172 is a deficient number, since it is larger than the sum of its proper divisors (166637671646084).

221921111124172 is a wasteful number, since it uses less digits than its factorization.

221921111124172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28119757568 (or 28119757566 counting only the distinct ones).

The product of its digits is 8064, while the sum is 37.

The spelling of 221921111124172 in words is "two hundred twenty-one trillion, nine hundred twenty-one billion, one hundred eleven million, one hundred twenty-four thousand, one hundred seventy-two".