21231120323 has 16 divisors (see below), whose sum is σ = 25277253120. Its totient is φ = 17453313600.

The previous prime is 21231120311. The next prime is 21231120343. The reversal of 21231120323 is 32302113212.

It is a cyclic number.

It is not a de Polignac number, because 21231120323 - 2⁴ = 21231120307 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21231120295 and 21231120304.

It is not an unprimeable number, because it can be changed into a prime (21231120343) 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, 609983 + ... + 643848.

It is an arithmetic number, because the mean of its divisors is an integer number (1579828320).

Almost surely, 2^21231120323 is an apocalyptic number.

21231120323 is a deficient number, since it is larger than the sum of its proper divisors (4046132797).

21231120323 is a wasteful number, since it uses less digits than its factorization.

21231120323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1253938.

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

Adding to 21231120323 its reverse (32302113212), we get a palindrome (53533233535).

The spelling of 21231120323 in words is "twenty-one billion, two hundred thirty-one million, one hundred twenty thousand, three hundred twenty-three".