21234503431 has 8 divisors (see below), whose sum is σ = 21288054528. Its totient is φ = 21181020000.

The previous prime is 21234503399. The next prime is 21234503441. The reversal of 21234503431 is 13430543212.

It is a happy number.

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 21234503431 - 2⁵ = 21234503399 is a prime.

It is a super-2 number, since 2×21234503431² (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 21234503431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234503441) 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, 643546 + ... + 675736.

It is an arithmetic number, because the mean of its divisors is an integer number (2661006816).

Almost surely, 2^21234503431 is an apocalyptic number.

21234503431 is a deficient number, since it is larger than the sum of its proper divisors (53551097).

21234503431 is an equidigital number, since it uses as much as digits as its factorization.

21234503431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33833.

The product of its (nonzero) digits is 8640, while the sum is 28.

The spelling of 21234503431 in words is "twenty-one billion, two hundred thirty-four million, five hundred three thousand, four hundred thirty-one".