21342431231 has 8 divisors (see below), whose sum is σ = 23337960528. Its totient is φ = 19356120000.

The previous prime is 21342431219. The next prime is 21342431237. The reversal of 21342431231 is 13213424312.

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 21342431231 - 2⁶ = 21342431167 is a prime.

It is a super-2 number, since 2×21342431231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21342431231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342431237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2299670 + ... + 2308931.

It is an arithmetic number, because the mean of its divisors is an integer number (2917245066).

Almost surely, 2^21342431231 is an apocalyptic number.

21342431231 is a deficient number, since it is larger than the sum of its proper divisors (1995529297).

21342431231 is a wasteful number, since it uses less digits than its factorization.

21342431231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4609033.

The product of its digits is 3456, while the sum is 26.

Adding to 21342431231 its reverse (13213424312), we get a palindrome (34555855543).

The spelling of 21342431231 in words is "twenty-one billion, three hundred forty-two million, four hundred thirty-one thousand, two hundred thirty-one".