21112212211001 has 4 divisors (see below), whose sum is σ = 21132930771600. Its totient is φ = 21091493650404.

The previous prime is 21112212210953. The next prime is 21112212211007. The reversal of 21112212211001 is 10011221221112.

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 21112212211001 - 2⁶ = 21112212210937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112212211007) 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, 10359278771 + ... + 10359280808.

It is an arithmetic number, because the mean of its divisors is an integer number (5283232692900).

Almost surely, 2^{21112212211001} is an apocalyptic number.

It is an amenable number.

21112212211001 is a deficient number, since it is larger than the sum of its proper divisors (20718560599).

21112212211001 is a wasteful number, since it uses less digits than its factorization.

21112212211001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20718560598.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21112212211001 its reverse (10011221221112), we get a palindrome (31123433432113).

The spelling of 21112212211001 in words is "twenty-one trillion, one hundred twelve billion, two hundred twelve million, two hundred eleven thousand, one".