21120112222001 has 4 divisors (see below), whose sum is σ = 22744736239092. Its totient is φ = 19495488204912.

The previous prime is 21120112221977. The next prime is 21120112222019. The reversal of 21120112222001 is 10022221102112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2089369066225 + 19030743155776 = 1445465^2 + 4362424^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120112222001 - 2³⁸ = 20845234315057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120112222031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 812312008526 + ... + 812312008551.

It is an arithmetic number, because the mean of its divisors is an integer number (5686184059773).

Almost surely, 2^{21120112222001} is an apocalyptic number.

It is an amenable number.

21120112222001 is a deficient number, since it is larger than the sum of its proper divisors (1624624017091).

21120112222001 is a wasteful number, since it uses less digits than its factorization.

21120112222001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624624017090.

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

Adding to 21120112222001 its reverse (10022221102112), we get a palindrome (31142333324113).

The spelling of 21120112222001 in words is "twenty-one trillion, one hundred twenty billion, one hundred twelve million, two hundred twenty-two thousand, one".