21240022130023 has 4 divisors (see below), whose sum is σ = 21240571702248. Its totient is φ = 21239472557800.

The previous prime is 21240022130011. The next prime is 21240022130051. The reversal of 21240022130023 is 32003122004212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21240022130023 - 2⁹ = 21240022129511 is a prime.

It is a super-2 number, since 2×21240022130023² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21240022129976 and 21240022130003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21240022131023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274728136 + ... + 274805437.

It is an arithmetic number, because the mean of its divisors is an integer number (5310142925562).

Almost surely, 2^{21240022130023} is an apocalyptic number.

21240022130023 is a deficient number, since it is larger than the sum of its proper divisors (549572225).

21240022130023 is an equidigital number, since it uses as much as digits as its factorization.

21240022130023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549572224.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21240022130023 its reverse (32003122004212), we get a palindrome (53243144134235).

The spelling of 21240022130023 in words is "twenty-one trillion, two hundred forty billion, twenty-two million, one hundred thirty thousand, twenty-three".