21231233100001 has 4 divisors (see below), whose sum is σ = 21274473901104. Its totient is φ = 21187992298900.

The previous prime is 21231233099981. The next prime is 21231233100029. The reversal of 21231233100001 is 10000133213212.

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 a de Polignac number, because none of the positive numbers 2^k-21231233100001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21231233104001) 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, 21620399815 + ... + 21620400796.

It is an arithmetic number, because the mean of its divisors is an integer number (5318618475276).

Almost surely, 2^{21231233100001} is an apocalyptic number.

It is an amenable number.

21231233100001 is a deficient number, since it is larger than the sum of its proper divisors (43240801103).

21231233100001 is an equidigital number, since it uses as much as digits as its factorization.

21231233100001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43240801102.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21231233100001 its reverse (10000133213212), we get a palindrome (31231366313213).

The spelling of 21231233100001 in words is "twenty-one trillion, two hundred thirty-one billion, two hundred thirty-three million, one hundred thousand, one".