21012331323 has 16 divisors (see below), whose sum is σ = 28159953920. Its totient is φ = 13936545504.

The previous prime is 21012331271. The next prime is 21012331357. The reversal of 21012331323 is 32313321012.

It is not a de Polignac number, because 21012331323 - 2¹⁸ = 21012069179 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21012331323.

It is not an unprimeable number, because it can be changed into a prime (21012331523) 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, 1143573 + ... + 1161801.

It is an arithmetic number, because the mean of its divisors is an integer number (1759997120).

Almost surely, 2^21012331323 is an apocalyptic number.

21012331323 is a deficient number, since it is larger than the sum of its proper divisors (7147622597).

21012331323 is a wasteful number, since it uses less digits than its factorization.

21012331323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20178.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21012331323 its reverse (32313321012), we get a palindrome (53325652335).

The spelling of 21012331323 in words is "twenty-one billion, twelve million, three hundred thirty-one thousand, three hundred twenty-three".