21442411897 has 2 divisors, whose sum is σ = 21442411898. Its totient is φ = 21442411896.

The previous prime is 21442411891. The next prime is 21442412021. The reversal of 21442411897 is 79811424412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12987793296 + 8454618601 = 113964^2 + 91949^2 .

It is a cyclic number.

It is not a de Polignac number, because 21442411897 - 2²⁷ = 21308194169 is a prime.

It is not a weakly prime, because it can be changed into another prime (21442411891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721205948 + 10721205949.

It is an arithmetic number, because the mean of its divisors is an integer number (10721205949).

Almost surely, 2^21442411897 is an apocalyptic number.

It is an amenable number.

21442411897 is a deficient number, since it is larger than the sum of its proper divisors (1).

21442411897 is an equidigital number, since it uses as much as digits as its factorization.

21442411897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 43.

The spelling of 21442411897 in words is "twenty-one billion, four hundred forty-two million, four hundred eleven thousand, eight hundred ninety-seven".