21131132321023 has 16 divisors (see below), whose sum is σ = 21389184609184. Its totient is φ = 20873931724800.

The previous prime is 21131132321021. The next prime is 21131132321051. The reversal of 21131132321023 is 32012323113112.

It is a cyclic number.

It is not a de Polignac number, because 21131132321023 - 2¹ = 21131132321021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131132321021) 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, 132165736 + ... + 132325522.

It is an arithmetic number, because the mean of its divisors is an integer number (1336824038074).

Almost surely, 2^{21131132321023} is an apocalyptic number.

21131132321023 is a deficient number, since it is larger than the sum of its proper divisors (258052288161).

21131132321023 is a wasteful number, since it uses less digits than its factorization.

21131132321023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162442.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 21131132321023 its reverse (32012323113112), we get a palindrome (53143455434135).

The spelling of 21131132321023 in words is "twenty-one trillion, one hundred thirty-one billion, one hundred thirty-two million, three hundred twenty-one thousand, twenty-three".