21422623121 has 2 divisors, whose sum is σ = 21422623122. Its totient is φ = 21422623120.

The previous prime is 21422623111. The next prime is 21422623163. The reversal of 21422623121 is 12132622412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14942373121 + 6480250000 = 122239^2 + 80500^2 .

It is a cyclic number.

It is not a de Polignac number, because 21422623121 - 2²² = 21418428817 is a prime.

It is not a weakly prime, because it can be changed into another prime (21422623111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10711311560 + 10711311561.

It is an arithmetic number, because the mean of its divisors is an integer number (10711311561).

Almost surely, 2^21422623121 is an apocalyptic number.

It is an amenable number.

21422623121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21422623121 is an equidigital number, since it uses as much as digits as its factorization.

21422623121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 26.

The spelling of 21422623121 in words is "twenty-one billion, four hundred twenty-two million, six hundred twenty-three thousand, one hundred twenty-one".