21231431122 has 16 divisors (see below), whose sum is σ = 34799599872. Its totient is φ = 9634745520.

The previous prime is 21231431099. The next prime is 21231431129. The reversal of 21231431122 is 22113413212.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21231431093 and 21231431102.

It is not an unprimeable number, because it can be changed into a prime (21231431129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 781593 + ... + 808300.

It is an arithmetic number, because the mean of its divisors is an integer number (2174974992).

Almost surely, 2^21231431122 is an apocalyptic number.

21231431122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21231431122 is a deficient number, since it is larger than the sum of its proper divisors (13568168750).

21231431122 is a wasteful number, since it uses less digits than its factorization.

21231431122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1590513.

The product of its digits is 576, while the sum is 22.

Adding to 21231431122 its reverse (22113413212), we get a palindrome (43344844334).

The spelling of 21231431122 in words is "twenty-one billion, two hundred thirty-one million, four hundred thirty-one thousand, one hundred twenty-two".