21614797 has 2 divisors, whose sum is σ = 21614798. Its totient is φ = 21614796.

The previous prime is 21614759. The next prime is 21614819. The reversal of 21614797 is 79741612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17690436 + 3924361 = 4206^2 + 1981^2 .

It is a cyclic number.

It is not a de Polignac number, because 21614797 - 2¹¹ = 21612749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21614737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10807398 + 10807399.

It is an arithmetic number, because the mean of its divisors is an integer number (10807399).

Almost surely, 2^21614797 is an apocalyptic number.

It is an amenable number.

21614797 is a deficient number, since it is larger than the sum of its proper divisors (1).

21614797 is an equidigital number, since it uses as much as digits as its factorization.

21614797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 37.

The square root of 21614797 is about 4649.1716466485. The cubic root of 21614797 is about 278.5589095655.

The spelling of 21614797 in words is "twenty-one million, six hundred fourteen thousand, seven hundred ninety-seven".