21102814331 has 4 divisors (see below), whose sum is σ = 21106894200. Its totient is φ = 21098734464.

The previous prime is 21102814277. The next prime is 21102814333. The reversal of 21102814331 is 13341820112.

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 21102814331 - 2¹⁰ = 21102813307 is a prime.

It is a super-2 number, since 2×21102814331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21102814331.

It is not an unprimeable number, because it can be changed into a prime (21102814333) 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, 2032166 + ... + 2042523.

It is an arithmetic number, because the mean of its divisors is an integer number (5276723550).

Almost surely, 2^21102814331 is an apocalyptic number.

21102814331 is a deficient number, since it is larger than the sum of its proper divisors (4079869).

21102814331 is an equidigital number, since it uses as much as digits as its factorization.

21102814331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4079868.

The product of its (nonzero) digits is 1152, while the sum is 26.

The spelling of 21102814331 in words is "twenty-one billion, one hundred two million, eight hundred fourteen thousand, three hundred thirty-one".