21131210103233 has 4 divisors (see below), whose sum is σ = 21131245287360. Its totient is φ = 21131174919108.

The previous prime is 21131210103197. The next prime is 21131210103277. The reversal of 21131210103233 is 33230101213112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21131210103233 - 2³⁶ = 21062490626497 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21131210103199 and 21131210103208.

It is not an unprimeable number, because it can be changed into a prime (21131210103433) 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, 16675253 + ... + 17897666.

It is an arithmetic number, because the mean of its divisors is an integer number (5282811321840).

Almost surely, 2^{21131210103233} is an apocalyptic number.

It is an amenable number.

21131210103233 is a deficient number, since it is larger than the sum of its proper divisors (35184127).

21131210103233 is an equidigital number, since it uses as much as digits as its factorization.

21131210103233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35184126.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 21131210103233 its reverse (33230101213112), we get a palindrome (54361311316345).

The spelling of 21131210103233 in words is "twenty-one trillion, one hundred thirty-one billion, two hundred ten million, one hundred three thousand, two hundred thirty-three".