2021311323023 has 16 divisors (see below), whose sum is σ = 2149374237696. Its totient is φ = 1896609755040.

The previous prime is 2021311323001. The next prime is 2021311323121. The reversal of 2021311323023 is 3203231131202.

It is a cyclic number.

It is not a de Polignac number, because 2021311323023 - 2¹² = 2021311318927 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

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 2021311323023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021311323223) 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, 6816536 + ... + 7106882.

It is an arithmetic number, because the mean of its divisors is an integer number (134335889856).

Almost surely, 2^{2021311323023} is an apocalyptic number.

2021311323023 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2021311323023 is a deficient number, since it is larger than the sum of its proper divisors (128062914673).

2021311323023 is a wasteful number, since it uses less digits than its factorization.

2021311323023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296134.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 2021311323023 its reverse (3203231131202), we get a palindrome (5224542454225).

The spelling of 2021311323023 in words is "two trillion, twenty-one billion, three hundred eleven million, three hundred twenty-three thousand, twenty-three".