21298062899 has 4 divisors (see below), whose sum is σ = 21300994536. Its totient is φ = 21295131264.

The previous prime is 21298062889. The next prime is 21298062911. The reversal of 21298062899 is 99826089212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21298062899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21298062839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1454894 + ... + 1469459.

It is an arithmetic number, because the mean of its divisors is an integer number (5325248634).

Almost surely, 2^21298062899 is an apocalyptic number.

21298062899 is a deficient number, since it is larger than the sum of its proper divisors (2931637).

21298062899 is an equidigital number, since it uses as much as digits as its factorization.

21298062899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2931636.

The product of its (nonzero) digits is 2239488, while the sum is 56.

The spelling of 21298062899 in words is "twenty-one billion, two hundred ninety-eight million, sixty-two thousand, eight hundred ninety-nine".