21323322131 has 4 divisors (see below), whose sum is σ = 22011171264. Its totient is φ = 20635473000.

The previous prime is 21323322127. The next prime is 21323322179. The reversal of 21323322131 is 13122332312.

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 21323322131 - 2² = 21323322127 is a prime.

It is a super-2 number, since 2×21323322131² (a number of 21 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 = 21323322097 and 21323322106.

It is not an unprimeable number, because it can be changed into a prime (21323322191) 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, 343924520 + ... + 343924581.

It is an arithmetic number, because the mean of its divisors is an integer number (5502792816).

Almost surely, 2^21323322131 is an apocalyptic number.

21323322131 is a deficient number, since it is larger than the sum of its proper divisors (687849133).

21323322131 is an equidigital number, since it uses as much as digits as its factorization.

21323322131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687849132.

The product of its digits is 1296, while the sum is 23.

Adding to 21323322131 its reverse (13122332312), we get a palindrome (34445654443).

The spelling of 21323322131 in words is "twenty-one billion, three hundred twenty-three million, three hundred twenty-two thousand, one hundred thirty-one".