21340410231 has 8 divisors (see below), whose sum is σ = 32518720384. Its totient is φ = 12194520120.

The previous prime is 21340410211. The next prime is 21340410257. The reversal of 21340410231 is 13201404312.

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

It is not a de Polignac number, because 21340410231 - 2⁶ = 21340410167 is a prime.

It is a super-3 number, since 3×21340410231³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 1016210011 = 21340410231 / (2 + 1 + 3 + 4 + 0 + 4 + 1 + 0 + 2 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21340410198 and 21340410207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21340410211) 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, 508104985 + ... + 508105026.

It is an arithmetic number, because the mean of its divisors is an integer number (4064840048).

Almost surely, 2^21340410231 is an apocalyptic number.

21340410231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21340410231 is a deficient number, since it is larger than the sum of its proper divisors (11178310153).

21340410231 is a wasteful number, since it uses less digits than its factorization.

21340410231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016210021.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21340410231 its reverse (13201404312), we get a palindrome (34541814543).

The spelling of 21340410231 in words is "twenty-one billion, three hundred forty million, four hundred ten thousand, two hundred thirty-one".