21012102323231 has 4 divisors (see below), whose sum is σ = 21012125712864. Its totient is φ = 21012078933600.

The previous prime is 21012102323227. The next prime is 21012102323249. The reversal of 21012102323231 is 13232320121012.

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 21012102323231 - 2² = 21012102323227 is a prime.

It is a super-2 number, since 2×21012102323231² (a number of 27 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 = 21012102323197 and 21012102323206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012102323281) 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, 10291130 + ... + 12162711.

It is an arithmetic number, because the mean of its divisors is an integer number (5253031428216).

Almost surely, 2^{21012102323231} is an apocalyptic number.

21012102323231 is a deficient number, since it is larger than the sum of its proper divisors (23389633).

21012102323231 is an equidigital number, since it uses as much as digits as its factorization.

21012102323231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23389632.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21012102323231 its reverse (13232320121012), we get a palindrome (34244422444243).

The spelling of 21012102323231 in words is "twenty-one trillion, twelve billion, one hundred two million, three hundred twenty-three thousand, two hundred thirty-one".