21122024423 has 4 divisors (see below), whose sum is σ = 21129970680. Its totient is φ = 21114078168.

The previous prime is 21122024411. The next prime is 21122024477. The reversal of 21122024423 is 32442022112.

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 21122024423 - 2⁸ = 21122024167 is a prime.

It is a super-2 number, since 2×21122024423² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122024123) 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, 3969140 + ... + 3974457.

It is an arithmetic number, because the mean of its divisors is an integer number (5282492670).

Almost surely, 2^21122024423 is an apocalyptic number.

21122024423 is a deficient number, since it is larger than the sum of its proper divisors (7946257).

21122024423 is an equidigital number, since it uses as much as digits as its factorization.

21122024423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7946256.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21122024423 its reverse (32442022112), we get a palindrome (53564046535).

The spelling of 21122024423 in words is "twenty-one billion, one hundred twenty-two million, twenty-four thousand, four hundred twenty-three".