21123253422 has 12 divisors (see below), whose sum is σ = 45767049120. Its totient is φ = 7041084468.

The previous prime is 21123253387. The next prime is 21123253427. The reversal of 21123253422 is 22435232112.

21123253422 is a `hidden beast` number, since 2 + 1 + 1 + 232 + 5 + 3 + 422 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123253427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 586757022 + ... + 586757057.

It is an arithmetic number, because the mean of its divisors is an integer number (3813920760).

Almost surely, 2^21123253422 is an apocalyptic number.

21123253422 is an abundant number, since it is smaller than the sum of its proper divisors (24643795698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21123253422 is a wasteful number, since it uses less digits than its factorization.

21123253422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1173514087 (or 1173514084 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

Adding to 21123253422 its reverse (22435232112), we get a palindrome (43558485534).

The spelling of 21123253422 in words is "twenty-one billion, one hundred twenty-three million, two hundred fifty-three thousand, four hundred twenty-two".