221002321121 has 2 divisors, whose sum is σ = 221002321122. Its totient is φ = 221002321120.

The previous prime is 221002321117. The next prime is 221002321193. The reversal of 221002321121 is 121123200122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134660375521 + 86341945600 = 366961^2 + 293840^2 .

It is a cyclic number.

It is not a de Polignac number, because 221002321121 - 2² = 221002321117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221002321121.

It is not a weakly prime, because it can be changed into another prime (221002323121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110501160560 + 110501160561.

It is an arithmetic number, because the mean of its divisors is an integer number (110501160561).

Almost surely, 2^221002321121 is an apocalyptic number.

It is an amenable number.

221002321121 is a deficient number, since it is larger than the sum of its proper divisors (1).

221002321121 is an equidigital number, since it uses as much as digits as its factorization.

221002321121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 221002321121 its reverse (121123200122), we get a palindrome (342125521243).

The spelling of 221002321121 in words is "two hundred twenty-one billion, two million, three hundred twenty-one thousand, one hundred twenty-one".