21323010031 has 4 divisors (see below), whose sum is σ = 21323569464. Its totient is φ = 21322450600.

The previous prime is 21323010013. The next prime is 21323010043. The reversal of 21323010031 is 13001032312.

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 21323010031 - 2⁵ = 21323009999 is a prime.

It is a super-2 number, since 2×21323010031² (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 = 21323009987 and 21323010014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323016031) 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, 218005 + ... + 300286.

It is an arithmetic number, because the mean of its divisors is an integer number (5330892366).

Almost surely, 2^21323010031 is an apocalyptic number.

21323010031 is a deficient number, since it is larger than the sum of its proper divisors (559433).

21323010031 is an equidigital number, since it uses as much as digits as its factorization.

21323010031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559432.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21323010031 its reverse (13001032312), we get a palindrome (34324042343).

The spelling of 21323010031 in words is "twenty-one billion, three hundred twenty-three million, ten thousand, thirty-one".