21322425121 has 2 divisors, whose sum is σ = 21322425122. Its totient is φ = 21322425120.

The previous prime is 21322425079. The next prime is 21322425143. The reversal of 21322425121 is 12152422312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14069518225 + 7252906896 = 118615^2 + 85164^2 .

It is a cyclic number.

It is not a de Polignac number, because 21322425121 - 2¹⁵ = 21322392353 is a prime.

It is not a weakly prime, because it can be changed into another prime (21322425161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661212560 + 10661212561.

It is an arithmetic number, because the mean of its divisors is an integer number (10661212561).

Almost surely, 2^21322425121 is an apocalyptic number.

It is an amenable number.

21322425121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21322425121 is an equidigital number, since it uses as much as digits as its factorization.

21322425121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 25.

Adding to 21322425121 its reverse (12152422312), we get a palindrome (33474847433).

The spelling of 21322425121 in words is "twenty-one billion, three hundred twenty-two million, four hundred twenty-five thousand, one hundred twenty-one".