221536051123129 has 2 divisors, whose sum is σ = 221536051123130. Its totient is φ = 221536051123128.

The previous prime is 221536051123073. The next prime is 221536051123151. The reversal of 221536051123129 is 921321150635122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 207252791460729 + 14283259662400 = 14396277^2 + 3779320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221536051123129 is a prime.

It is not a weakly prime, because it can be changed into another prime (221536051123159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110768025561564 + 110768025561565.

It is an arithmetic number, because the mean of its divisors is an integer number (110768025561565).

Almost surely, 2^{221536051123129} is an apocalyptic number.

It is an amenable number.

221536051123129 is a deficient number, since it is larger than the sum of its proper divisors (1).

221536051123129 is an equidigital number, since it uses as much as digits as its factorization.

221536051123129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 221536051123129 in words is "two hundred twenty-one trillion, five hundred thirty-six billion, fifty-one million, one hundred twenty-three thousand, one hundred twenty-nine".