21220012122901 has 2 divisors, whose sum is σ = 21220012122902. Its totient is φ = 21220012122900.

The previous prime is 21220012122847. The next prime is 21220012122919. The reversal of 21220012122901 is 10922121002212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11054787115876 + 10165225007025 = 3324874^2 + 3188295^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21220012122901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220012222901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610006061450 + 10610006061451.

It is an arithmetic number, because the mean of its divisors is an integer number (10610006061451).

Almost surely, 2^{21220012122901} is an apocalyptic number.

It is an amenable number.

21220012122901 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220012122901 is an equidigital number, since it uses as much as digits as its factorization.

21220012122901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 21220012122901 in words is "twenty-one trillion, two hundred twenty billion, twelve million, one hundred twenty-two thousand, nine hundred one".