21020211299 has 4 divisors (see below), whose sum is σ = 21333945864. Its totient is φ = 20706476736.

The previous prime is 21020211281. The next prime is 21020211353. The reversal of 21020211299 is 99211202012.

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

It is a cyclic number.

It is not a de Polignac number, because 21020211299 - 2²⁴ = 21003434083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020211209) 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, 156867182 + ... + 156867315.

It is an arithmetic number, because the mean of its divisors is an integer number (5333486466).

Almost surely, 2^21020211299 is an apocalyptic number.

21020211299 is a deficient number, since it is larger than the sum of its proper divisors (313734565).

21020211299 is an equidigital number, since it uses as much as digits as its factorization.

21020211299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313734564.

The product of its (nonzero) digits is 1296, while the sum is 29.

The spelling of 21020211299 in words is "twenty-one billion, twenty million, two hundred eleven thousand, two hundred ninety-nine".