21231320200123 has 8 divisors (see below), whose sum is σ = 23700078363456. Its totient is φ = 18852335061000.

The previous prime is 21231320200117. The next prime is 21231320200157. The reversal of 21231320200123 is 32100202313212.

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 21231320200123 - 2¹⁷ = 21231320069051 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21231320200094 and 21231320200103.

It is not an unprimeable number, because it can be changed into a prime (21231320200193) 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, 22443255553 + ... + 22443256498.

It is an arithmetic number, because the mean of its divisors is an integer number (2962509795432).

Almost surely, 2^{21231320200123} is an apocalyptic number.

21231320200123 is a deficient number, since it is larger than the sum of its proper divisors (2468758163333).

21231320200123 is a wasteful number, since it uses less digits than its factorization.

21231320200123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44886512105.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21231320200123 its reverse (32100202313212), we get a palindrome (53331522513335).

The spelling of 21231320200123 in words is "twenty-one trillion, two hundred thirty-one billion, three hundred twenty million, two hundred thousand, one hundred twenty-three".