21323121332 has 12 divisors (see below), whose sum is σ = 38019528036. Its totient is φ = 10460399040.

The previous prime is 21323121331. The next prime is 21323121361. The reversal of 21323121332 is 23312132312.

It can be written as a sum of positive squares in 2 ways, for example, as 18445442596 + 2877678736 = 135814^2 + 53644^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21323121298 and 21323121307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323121331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50290169 + ... + 50290592.

It is an arithmetic number, because the mean of its divisors is an integer number (3168294003).

Almost surely, 2^21323121332 is an apocalyptic number.

It is an amenable number.

21323121332 is a deficient number, since it is larger than the sum of its proper divisors (16696406704).

21323121332 is a wasteful number, since it uses less digits than its factorization.

21323121332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100580818 (or 100580816 counting only the distinct ones).

The product of its digits is 1296, while the sum is 23.

Adding to 21323121332 its reverse (23312132312), we get a palindrome (44635253644).

The spelling of 21323121332 in words is "twenty-one billion, three hundred twenty-three million, one hundred twenty-one thousand, three hundred thirty-two".