21311020323 has 32 divisors (see below), whose sum is σ = 33341575680. Its totient is φ = 13425873120.

The previous prime is 21311020309. The next prime is 21311020343. The reversal of 21311020323 is 32302011312.

21311020323 is a `hidden beast` number, since 213 + 110 + 20 + 323 = 666.

It is not a de Polignac number, because 21311020323 - 2¹⁰ = 21311019299 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21311020296 and 21311020305.

It is not an unprimeable number, because it can be changed into a prime (21311020343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 155188 + ... + 258273.

It is an arithmetic number, because the mean of its divisors is an integer number (1041924240).

Almost surely, 2^21311020323 is an apocalyptic number.

21311020323 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21311020323 is a deficient number, since it is larger than the sum of its proper divisors (12030555357).

21311020323 is a wasteful number, since it uses less digits than its factorization.

21311020323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413576 (or 413570 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21311020323 its reverse (32302011312), we get a palindrome (53613031635).

The spelling of 21311020323 in words is "twenty-one billion, three hundred eleven million, twenty thousand, three hundred twenty-three".