221002121129 has 2 divisors, whose sum is σ = 221002121130. Its totient is φ = 221002121128.

The previous prime is 221002121071. The next prime is 221002121203. The reversal of 221002121129 is 921121200122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128001519529 + 93000601600 = 357773^2 + 304960^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221002121129 is a prime.

It is not a weakly prime, because it can be changed into another prime (221007121129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110501060564 + 110501060565.

It is an arithmetic number, because the mean of its divisors is an integer number (110501060565).

Almost surely, 2^221002121129 is an apocalyptic number.

It is an amenable number.

221002121129 is a deficient number, since it is larger than the sum of its proper divisors (1).

221002121129 is an equidigital number, since it uses as much as digits as its factorization.

221002121129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 221002121129 in words is "two hundred twenty-one billion, two million, one hundred twenty-one thousand, one hundred twenty-nine".