21112211001201 has 4 divisors (see below), whose sum is σ = 28149614668272. Its totient is φ = 14074807334132.

The previous prime is 21112211001169. The next prime is 21112211001227. The reversal of 21112211001201 is 10210011221112.

It is a happy number.

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 21112211001201 - 2⁵ = 21112211001169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21112211081201) 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, 3518701833531 + ... + 3518701833536.

It is an arithmetic number, because the mean of its divisors is an integer number (7037403667068).

Almost surely, 2^{21112211001201} is an apocalyptic number.

It is an amenable number.

21112211001201 is a deficient number, since it is larger than the sum of its proper divisors (7037403667071).

21112211001201 is an equidigital number, since it uses as much as digits as its factorization.

21112211001201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7037403667070.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21112211001201 its reverse (10210011221112), we get a palindrome (31322222222313).

The spelling of 21112211001201 in words is "twenty-one trillion, one hundred twelve billion, two hundred eleven million, one thousand, two hundred one".