21331100231 has 16 divisors (see below), whose sum is σ = 24447017280. Its totient is φ = 18232404480.

The previous prime is 21331100227. The next prime is 21331100281. The reversal of 21331100231 is 13200113312.

It is a cyclic number.

It is not a de Polignac number, because 21331100231 - 2² = 21331100227 is a prime.

It is a super-2 number, since 2×21331100231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331100281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6629135 + ... + 6632351.

It is an arithmetic number, because the mean of its divisors is an integer number (1527938580).

Almost surely, 2^21331100231 is an apocalyptic number.

21331100231 is a deficient number, since it is larger than the sum of its proper divisors (3115917049).

21331100231 is a wasteful number, since it uses less digits than its factorization.

21331100231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5594.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21331100231 its reverse (13200113312), we get a palindrome (34531213543).

The spelling of 21331100231 in words is "twenty-one billion, three hundred thirty-one million, one hundred thousand, two hundred thirty-one".