21422423231 has 16 divisors (see below), whose sum is σ = 24785919648. Its totient is φ = 18298752000.

The previous prime is 21422423203. The next prime is 21422423273. The reversal of 21422423231 is 13232422412.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21422423231 is a prime.

It is a super-2 number, since 2×21422423231² (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 21422423231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21422423201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17081 + ... + 207693.

It is an arithmetic number, because the mean of its divisors is an integer number (1549119978).

Almost surely, 2^21422423231 is an apocalyptic number.

21422423231 is a deficient number, since it is larger than the sum of its proper divisors (3363496417).

21422423231 is a wasteful number, since it uses less digits than its factorization.

21422423231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191242.

The product of its digits is 4608, while the sum is 26.

Adding to 21422423231 its reverse (13232422412), we get a palindrome (34654845643).

The spelling of 21422423231 in words is "twenty-one billion, four hundred twenty-two million, four hundred twenty-three thousand, two hundred thirty-one".