21344340231 has 6 divisors (see below), whose sum is σ = 30830713680. Its totient is φ = 14229560148.

The previous prime is 21344340229. The next prime is 21344340247. The reversal of 21344340231 is 13204344312.

21344340231 is a `hidden beast` number, since 213 + 4 + 43 + 402 + 3 + 1 = 666.

It is not a de Polignac number, because 21344340231 - 2¹ = 21344340229 is a prime.

It is a super-2 number, since 2×21344340231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21344340195 and 21344340204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344340221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1185796671 + ... + 1185796688.

It is an arithmetic number, because the mean of its divisors is an integer number (5138452280).

Almost surely, 2^21344340231 is an apocalyptic number.

21344340231 is a deficient number, since it is larger than the sum of its proper divisors (9486373449).

21344340231 is a wasteful number, since it uses less digits than its factorization.

21344340231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2371593365 (or 2371593362 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 21344340231 its reverse (13204344312), we get a palindrome (34548684543).

The spelling of 21344340231 in words is "twenty-one billion, three hundred forty-four million, three hundred forty thousand, two hundred thirty-one".