21112222201 has 8 divisors (see below), whose sum is σ = 24433675520. Its totient is φ = 17867124288.

The previous prime is 21112222181. The next prime is 21112222211. The reversal of 21112222201 is 10222221112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21112222201 - 2⁷ = 21112222073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112222211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19088256 + ... + 19089361.

It is an arithmetic number, because the mean of its divisors is an integer number (3054209440).

Almost surely, 2^21112222201 is an apocalyptic number.

It is an amenable number.

21112222201 is a deficient number, since it is larger than the sum of its proper divisors (3321453319).

21112222201 is an equidigital number, since it uses as much as digits as its factorization.

21112222201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38177703.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21112222201 its reverse (10222221112), we get a palindrome (31334443313).

The spelling of 21112222201 in words is "twenty-one billion, one hundred twelve million, two hundred twenty-two thousand, two hundred one".