21131342231 has 8 divisors (see below), whose sum is σ = 22345024128. Its totient is φ = 19950912000.

The previous prime is 21131342213. The next prime is 21131342249. The reversal of 21131342231 is 13224313112.

It is an interprime number because it is at equal distance from previous prime (21131342213) and next prime (21131342249).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21131342231 is a prime.

It is a super-2 number, since 2×21131342231² (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 = 21131342197 and 21131342206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131342201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8311610 + ... + 8314151.

It is an arithmetic number, because the mean of its divisors is an integer number (2793128016).

Almost surely, 2^21131342231 is an apocalyptic number.

21131342231 is a deficient number, since it is larger than the sum of its proper divisors (1213681897).

21131342231 is a wasteful number, since it uses less digits than its factorization.

21131342231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16625833.

The product of its digits is 864, while the sum is 23.

Adding to 21131342231 its reverse (13224313112), we get a palindrome (34355655343).

The spelling of 21131342231 in words is "twenty-one billion, one hundred thirty-one million, three hundred forty-two thousand, two hundred thirty-one".