221357076221 has 2 divisors, whose sum is σ = 221357076222. Its totient is φ = 221357076220.

The previous prime is 221357076167. The next prime is 221357076247. The reversal of 221357076221 is 122670753122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221357076196 + 25 = 470486^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 221357076221 - 2²² = 221352881917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221357076121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110678538110 + 110678538111.

It is an arithmetic number, because the mean of its divisors is an integer number (110678538111).

Almost surely, 2^221357076221 is an apocalyptic number.

It is an amenable number.

221357076221 is a deficient number, since it is larger than the sum of its proper divisors (1).

221357076221 is an equidigital number, since it uses as much as digits as its factorization.

221357076221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 38.

The spelling of 221357076221 in words is "two hundred twenty-one billion, three hundred fifty-seven million, seventy-six thousand, two hundred twenty-one".