21123321122201 has 4 divisors (see below), whose sum is σ = 21180877855872. Its totient is φ = 21065764388532.

The previous prime is 21123321122191. The next prime is 21123321122221. The reversal of 21123321122201 is 10222112332112.

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-21123321122201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21123321122221) 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, 28778366285 + ... + 28778367018.

It is an arithmetic number, because the mean of its divisors is an integer number (5295219463968).

Almost surely, 2^{21123321122201} is an apocalyptic number.

It is an amenable number.

21123321122201 is a deficient number, since it is larger than the sum of its proper divisors (57556733671).

21123321122201 is an equidigital number, since it uses as much as digits as its factorization.

21123321122201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57556733670.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 21123321122201 its reverse (10222112332112), we get a palindrome (31345433454313).

The spelling of 21123321122201 in words is "twenty-one trillion, one hundred twenty-three billion, three hundred twenty-one million, one hundred twenty-two thousand, two hundred one".