21311020299 has 4 divisors (see below), whose sum is σ = 28414693736. Its totient is φ = 14207346864.

The previous prime is 21311020253. The next prime is 21311020309. The reversal of 21311020299 is 99202011312.

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

It is not a de Polignac number, because 21311020299 - 2⁸ = 21311020043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21311020219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3551836714 + ... + 3551836719.

It is an arithmetic number, because the mean of its divisors is an integer number (7103673434).

Almost surely, 2^21311020299 is an apocalyptic number.

21311020299 is a deficient number, since it is larger than the sum of its proper divisors (7103673437).

21311020299 is an equidigital number, since it uses as much as digits as its factorization.

21311020299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7103673436.

The product of its (nonzero) digits is 1944, while the sum is 30.

The spelling of 21311020299 in words is "twenty-one billion, three hundred eleven million, twenty thousand, two hundred ninety-nine".