21313024231 has 4 divisors (see below), whose sum is σ = 21404496672. Its totient is φ = 21221551792.

The previous prime is 21313024199. The next prime is 21313024237. The reversal of 21313024231 is 13242031312.

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 21313024231 - 2⁵ = 21313024199 is a prime.

It is a super-2 number, since 2×21313024231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313024237) 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, 45735871 + ... + 45736336.

It is an arithmetic number, because the mean of its divisors is an integer number (5351124168).

Almost surely, 2^21313024231 is an apocalyptic number.

21313024231 is a deficient number, since it is larger than the sum of its proper divisors (91472441).

21313024231 is an equidigital number, since it uses as much as digits as its factorization.

21313024231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91472440.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21313024231 its reverse (13242031312), we get a palindrome (34555055543).

The spelling of 21313024231 in words is "twenty-one billion, three hundred thirteen million, twenty-four thousand, two hundred thirty-one".