21325213023 has 32 divisors (see below), whose sum is σ = 29221834752. Its totient is φ = 13829088000.

The previous prime is 21325213003. The next prime is 21325213073. The reversal of 21325213023 is 32031252312.

It is a happy number.

It is not a de Polignac number, because 21325213023 - 2¹⁷ = 21325081951 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21325212984 and 21325213002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21325213003) 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, 6731986 + ... + 6735152.

It is an arithmetic number, because the mean of its divisors is an integer number (913182336).

Almost surely, 2^21325213023 is an apocalyptic number.

21325213023 is a deficient number, since it is larger than the sum of its proper divisors (7896621729).

21325213023 is a wasteful number, since it uses less digits than its factorization.

21325213023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3655.

The product of its (nonzero) digits is 2160, while the sum is 24.

Adding to 21325213023 its reverse (32031252312), we get a palindrome (53356465335).

The spelling of 21325213023 in words is "twenty-one billion, three hundred twenty-five million, two hundred thirteen thousand, twenty-three".