21422897 has 2 divisors, whose sum is σ = 21422898. Its totient is φ = 21422896.

The previous prime is 21422837. The next prime is 21422939. The reversal of 21422897 is 79822412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19722481 + 1700416 = 4441^2 + 1304^2 .

It is a cyclic number.

It is not a de Polignac number, because 21422897 - 2⁶ = 21422833 is a prime.

It is not a weakly prime, because it can be changed into another prime (21422837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10711448 + 10711449.

It is an arithmetic number, because the mean of its divisors is an integer number (10711449).

Almost surely, 2^21422897 is an apocalyptic number.

It is an amenable number.

21422897 is a deficient number, since it is larger than the sum of its proper divisors (1).

21422897 is an equidigital number, since it uses as much as digits as its factorization.

21422897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 35.

The square root of 21422897 is about 4628.4875499454. The cubic root of 21422897 is about 277.7320927119.

The spelling of 21422897 in words is "twenty-one million, four hundred twenty-two thousand, eight hundred ninety-seven".