21120212221001 has 4 divisors (see below), whose sum is σ = 21130067665152. Its totient is φ = 21110356776852.

The previous prime is 21120212220959. The next prime is 21120212221019. The reversal of 21120212221001 is 10012221202112.

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 21120212221001 - 2²⁶ = 21120145112137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120212221061) 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, 4927718861 + ... + 4927723146.

It is an arithmetic number, because the mean of its divisors is an integer number (5282516916288).

Almost surely, 2^{21120212221001} is an apocalyptic number.

It is an amenable number.

21120212221001 is a deficient number, since it is larger than the sum of its proper divisors (9855444151).

21120212221001 is an equidigital number, since it uses as much as digits as its factorization.

21120212221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9855444150.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21120212221001 its reverse (10012221202112), we get a palindrome (31132433423113).

The spelling of 21120212221001 in words is "twenty-one trillion, one hundred twenty billion, two hundred twelve million, two hundred twenty-one thousand, one".