21231331022 has 32 divisors (see below), whose sum is σ = 35614101600. Its totient is φ = 9408729600.

The previous prime is 21231331021. The next prime is 21231331039. The reversal of 21231331022 is 22013313212.

It is a junction number, because it is equal to n+sod(n) for n = 21231330985 and 21231331003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231331021) 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, 1444004 + ... + 1458632.

It is an arithmetic number, because the mean of its divisors is an integer number (1112940675).

Almost surely, 2^21231331022 is an apocalyptic number.

21231331022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21231331022 is a deficient number, since it is larger than the sum of its proper divisors (14382770578).

21231331022 is a wasteful number, since it uses less digits than its factorization.

21231331022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16292.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21231331022 its reverse (22013313212), we get a palindrome (43244644234).

It can be divided in two parts, 21231 and 331022, that added together give a palindrome (352253).

The spelling of 21231331022 in words is "twenty-one billion, two hundred thirty-one million, three hundred thirty-one thousand, twenty-two".