21102111299 has 4 divisors (see below), whose sum is σ = 21105286920. Its totient is φ = 21098935680.

The previous prime is 21102111287. The next prime is 21102111337. The reversal of 21102111299 is 99211120112.

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 21102111299 - 2²⁸ = 20833675843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21102113299) 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, 1577822 + ... + 1591139.

It is an arithmetic number, because the mean of its divisors is an integer number (5276321730).

Almost surely, 2^21102111299 is an apocalyptic number.

21102111299 is a deficient number, since it is larger than the sum of its proper divisors (3175621).

21102111299 is an equidigital number, since it uses as much as digits as its factorization.

21102111299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3175620.

The product of its (nonzero) digits is 648, while the sum is 29.

The spelling of 21102111299 in words is "twenty-one billion, one hundred two million, one hundred eleven thousand, two hundred ninety-nine".