221657267520345 has 32 divisors (see below), whose sum is σ = 373344977710080. Its totient is φ = 111987008602560.

The previous prime is 221657267520341. The next prime is 221657267520373. The reversal of 221657267520345 is 543025762756122.

It is not a de Polignac number, because 221657267520345 - 2² = 221657267520341 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (221657267520341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24739059 + ... + 32485928.

It is an arithmetic number, because the mean of its divisors is an integer number (11667030553440).

Almost surely, 2^{221657267520345} is an apocalyptic number.

It is an amenable number.

221657267520345 is a deficient number, since it is larger than the sum of its proper divisors (151687710189735).

221657267520345 is a wasteful number, since it uses less digits than its factorization.

221657267520345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57238605.

The product of its (nonzero) digits is 42336000, while the sum is 57.

The spelling of 221657267520345 in words is "two hundred twenty-one trillion, six hundred fifty-seven billion, two hundred sixty-seven million, five hundred twenty thousand, three hundred forty-five".