21130312231 has 8 divisors (see below), whose sum is σ = 25569453600. Its totient is φ = 17046302208.

The previous prime is 21130312211. The next prime is 21130312279. The reversal of 21130312231 is 13221303112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21130312231 - 2⁷ = 21130312103 is a prime.

It is a super-2 number, since 2×21130312231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21130312199 and 21130312208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130312211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88782706 + ... + 88782943.

It is an arithmetic number, because the mean of its divisors is an integer number (3196181700).

Almost surely, 2^21130312231 is an apocalyptic number.

21130312231 is a deficient number, since it is larger than the sum of its proper divisors (4439141369).

21130312231 is a wasteful number, since it uses less digits than its factorization.

21130312231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177565673.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21130312231 its reverse (13221303112), we get a palindrome (34351615343).

The spelling of 21130312231 in words is "twenty-one billion, one hundred thirty million, three hundred twelve thousand, two hundred thirty-one".