21319925699 has 2 divisors, whose sum is σ = 21319925700. Its totient is φ = 21319925698.

The previous prime is 21319925687. The next prime is 21319925789. The reversal of 21319925699 is 99652991312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21319925699 - 2⁸ = 21319925443 is a prime.

It is not a weakly prime, because it can be changed into another prime (21319921699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10659962849 + 10659962850.

It is an arithmetic number, because the mean of its divisors is an integer number (10659962850).

Almost surely, 2^21319925699 is an apocalyptic number.

21319925699 is a deficient number, since it is larger than the sum of its proper divisors (1).

21319925699 is an equidigital number, since it uses as much as digits as its factorization.

21319925699 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2361960, while the sum is 56.

The spelling of 21319925699 in words is "twenty-one billion, three hundred nineteen million, nine hundred twenty-five thousand, six hundred ninety-nine".