21000311023 has 16 divisors (see below), whose sum is σ = 22133606400. Its totient is φ = 19885635616.

The previous prime is 21000311011. The next prime is 21000311029. The reversal of 21000311023 is 32011300012.

It is a cyclic number.

It is not a de Polignac number, because 21000311023 - 2¹³ = 21000302831 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000310994 and 21000311012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000311029) 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, 5902161 + ... + 5905717.

It is an arithmetic number, because the mean of its divisors is an integer number (1383350400).

Almost surely, 2^21000311023 is an apocalyptic number.

21000311023 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21000311023 is a deficient number, since it is larger than the sum of its proper divisors (1133295377).

21000311023 is a wasteful number, since it uses less digits than its factorization.

21000311023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6086.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21000311023 its reverse (32011300012), we get a palindrome (53011611035).

The spelling of 21000311023 in words is "twenty-one billion, three hundred eleven thousand, twenty-three".