21425297 has 2 divisors, whose sum is σ = 21425298. Its totient is φ = 21425296.

The previous prime is 21425291. The next prime is 21425311. The reversal of 21425297 is 79252412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18181696 + 3243601 = 4264^2 + 1801^2 .

It is a cyclic number.

It is not a de Polignac number, because 21425297 - 2⁶ = 21425233 is a prime.

It is not a weakly prime, because it can be changed into another prime (21425291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10712648 + 10712649.

It is an arithmetic number, because the mean of its divisors is an integer number (10712649).

Almost surely, 2^21425297 is an apocalyptic number.

It is an amenable number.

21425297 is a deficient number, since it is larger than the sum of its proper divisors (1).

21425297 is an equidigital number, since it uses as much as digits as its factorization.

21425297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 32.

The square root of 21425297 is about 4628.7468066422. The cubic root of 21425297 is about 277.7424637359.

The spelling of 21425297 in words is "twenty-one million, four hundred twenty-five thousand, two hundred ninety-seven".