21962659 has 2 divisors, whose sum is σ = 21962660. Its totient is φ = 21962658.

The previous prime is 21962621. The next prime is 21962683. The reversal of 21962659 is 95626912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21962659 - 2⁷ = 21962531 is a prime.

It is not a weakly prime, because it can be changed into another prime (21962609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10981329 + 10981330.

It is an arithmetic number, because the mean of its divisors is an integer number (10981330).

Almost surely, 2^21962659 is an apocalyptic number.

21962659 is a deficient number, since it is larger than the sum of its proper divisors (1).

21962659 is an equidigital number, since it uses as much as digits as its factorization.

21962659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 40.

The square root of 21962659 is about 4686.4335053428. The cubic root of 21962659 is about 280.0453115445.

The spelling of 21962659 in words is "twenty-one million, nine hundred sixty-two thousand, six hundred fifty-nine".