21023311323 has 32 divisors (see below), whose sum is σ = 33091080192. Its totient is φ = 11618006400.

The previous prime is 21023311321. The next prime is 21023311333. The reversal of 21023311323 is 32311332012.

It is not a de Polignac number, because 21023311323 - 2¹ = 21023311321 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 21023311323.

It is not an unprimeable number, because it can be changed into a prime (21023311321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1040053 + ... + 1060073.

It is an arithmetic number, because the mean of its divisors is an integer number (1034096256).

Almost surely, 2^21023311323 is an apocalyptic number.

21023311323 is a deficient number, since it is larger than the sum of its proper divisors (12067768869).

21023311323 is a wasteful number, since it uses less digits than its factorization.

21023311323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21675.

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

Adding to 21023311323 its reverse (32311332012), we get a palindrome (53334643335).

The spelling of 21023311323 in words is "twenty-one billion, twenty-three million, three hundred eleven thousand, three hundred twenty-three".