21231000023 has 8 divisors (see below), whose sum is σ = 21555469488. Its totient is φ = 20908165824.

The previous prime is 21231000013. The next prime is 21231000031. The reversal of 21231000023 is 32000013212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21231000023 - 2⁸ = 21230999767 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21230999971 and 21231000007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231000013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 382640 + ... + 434597.

It is an arithmetic number, because the mean of its divisors is an integer number (2694433686).

Almost surely, 2^21231000023 is an apocalyptic number.

21231000023 is a deficient number, since it is larger than the sum of its proper divisors (324469465).

21231000023 is an equidigital number, since it uses as much as digits as its factorization.

21231000023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817633.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21231000023 its reverse (32000013212), we get a palindrome (53231013235).

The spelling of 21231000023 in words is "twenty-one billion, two hundred thirty-one million, twenty-three", and thus it is an aban number.