21298370699 has 2 divisors, whose sum is σ = 21298370700. Its totient is φ = 21298370698.

The previous prime is 21298370671. The next prime is 21298370711. The reversal of 21298370699 is 99607389212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21298370699 - 2²⁴ = 21281593483 is a prime.

It is not a weakly prime, because it can be changed into another prime (21298370609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10649185349 + 10649185350.

It is an arithmetic number, because the mean of its divisors is an integer number (10649185350).

Almost surely, 2^21298370699 is an apocalyptic number.

21298370699 is a deficient number, since it is larger than the sum of its proper divisors (1).

21298370699 is an equidigital number, since it uses as much as digits as its factorization.

21298370699 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2939328, while the sum is 56.

The spelling of 21298370699 in words is "twenty-one billion, two hundred ninety-eight million, three hundred seventy thousand, six hundred ninety-nine".