21331302423 has 4 divisors (see below), whose sum is σ = 28441736568. Its totient is φ = 14220868280.

The previous prime is 21331302401. The next prime is 21331302427. The reversal of 21331302423 is 32420313312.

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 21331302423 - 2¹² = 21331298327 is a prime.

It is a super-2 number, since 2×21331302423² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21331302393 and 21331302402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331302427) 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, 3555217068 + ... + 3555217073.

It is an arithmetic number, because the mean of its divisors is an integer number (7110434142).

Almost surely, 2^21331302423 is an apocalyptic number.

21331302423 is a deficient number, since it is larger than the sum of its proper divisors (7110434145).

21331302423 is an equidigital number, since it uses as much as digits as its factorization.

21331302423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7110434144.

The product of its (nonzero) digits is 2592, while the sum is 24.

Adding to 21331302423 its reverse (32420313312), we get a palindrome (53751615735).

The spelling of 21331302423 in words is "twenty-one billion, three hundred thirty-one million, three hundred two thousand, four hundred twenty-three".