21130699 has 2 divisors, whose sum is σ = 21130700. Its totient is φ = 21130698.

The previous prime is 21130667. The next prime is 21130727. The reversal of 21130699 is 99603112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21130699 - 2⁵ = 21130667 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21130699.

It is not a weakly prime, because it can be changed into another prime (21130619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565349 + 10565350.

It is an arithmetic number, because the mean of its divisors is an integer number (10565350).

Almost surely, 2^21130699 is an apocalyptic number.

21130699 is a deficient number, since it is larger than the sum of its proper divisors (1).

21130699 is an equidigital number, since it uses as much as digits as its factorization.

21130699 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 21130699 is about 4596.8140053737. The cubic root of 21130699 is about 276.4635972162.

The spelling of 21130699 in words is "twenty-one million, one hundred thirty thousand, six hundred ninety-nine".