221452471210121 has 2 divisors, whose sum is σ = 221452471210122. Its totient is φ = 221452471210120.

The previous prime is 221452471210067. The next prime is 221452471210127. The reversal of 221452471210121 is 121012174254122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209048945175625 + 12403526034496 = 14458525^2 + 3521864^2 .

It is a cyclic number.

It is not a de Polignac number, because 221452471210121 - 2¹⁸ = 221452470947977 is a prime.

It is not a weakly prime, because it can be changed into another prime (221452471210127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110726235605060 + 110726235605061.

It is an arithmetic number, because the mean of its divisors is an integer number (110726235605061).

Almost surely, 2^{221452471210121} is an apocalyptic number.

It is an amenable number.

221452471210121 is a deficient number, since it is larger than the sum of its proper divisors (1).

221452471210121 is an equidigital number, since it uses as much as digits as its factorization.

221452471210121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17920, while the sum is 35.

The spelling of 221452471210121 in words is "two hundred twenty-one trillion, four hundred fifty-two billion, four hundred seventy-one million, two hundred ten thousand, one hundred twenty-one".