221375973 has 96 divisors (see below), whose sum is σ = 398208000. Its totient is φ = 108972864.

The previous prime is 221375953. The next prime is 221375977. The reversal of 221375973 is 379573122.

It is not a de Polignac number, because 221375973 - 2²⁰ = 220327397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221375977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3304086 + ... + 3304152.

It is an arithmetic number, because the mean of its divisors is an integer number (4148000).

Almost surely, 2^221375973 is an apocalyptic number.

It is an amenable number.

221375973 is a deficient number, since it is larger than the sum of its proper divisors (176832027).

221375973 is a wasteful number, since it uses less digits than its factorization.

221375973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136 (or 109 counting only the distinct ones).

The product of its digits is 79380, while the sum is 39.

The square root of 221375973 is about 14878.7087141324. The cubic root of 221375973 is about 604.9370177816.

The spelling of 221375973 in words is "two hundred twenty-one million, three hundred seventy-five thousand, nine hundred seventy-three".