21340310231 has 4 divisors (see below), whose sum is σ = 21658822392. Its totient is φ = 21021798072.

The previous prime is 21340310219. The next prime is 21340310249. The reversal of 21340310231 is 13201304312.

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 21340310231 - 2¹⁴ = 21340293847 is a prime.

It is a super-2 number, since 2×21340310231² (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 (21340310261) 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, 159255980 + ... + 159256113.

It is an arithmetic number, because the mean of its divisors is an integer number (5414705598).

Almost surely, 2^21340310231 is an apocalyptic number.

21340310231 is a deficient number, since it is larger than the sum of its proper divisors (318512161).

21340310231 is an equidigital number, since it uses as much as digits as its factorization.

21340310231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318512160.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21340310231 its reverse (13201304312), we get a palindrome (34541614543).

The spelling of 21340310231 in words is "twenty-one billion, three hundred forty million, three hundred ten thousand, two hundred thirty-one".