221934102157 has 2 divisors, whose sum is σ = 221934102158. Its totient is φ = 221934102156.

The previous prime is 221934102119. The next prime is 221934102191. The reversal of 221934102157 is 751201439122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196608880836 + 25325221321 = 443406^2 + 159139^2 .

It is a cyclic number.

It is not a de Polignac number, because 221934102157 - 2⁷ = 221934102029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221934102107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110967051078 + 110967051079.

It is an arithmetic number, because the mean of its divisors is an integer number (110967051079).

Almost surely, 2^221934102157 is an apocalyptic number.

It is an amenable number.

221934102157 is a deficient number, since it is larger than the sum of its proper divisors (1).

221934102157 is an equidigital number, since it uses as much as digits as its factorization.

221934102157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 221934102157 in words is "two hundred twenty-one billion, nine hundred thirty-four million, one hundred two thousand, one hundred fifty-seven".