22121111211 has 4 divisors (see below), whose sum is σ = 29494814952. Its totient is φ = 14747407472.

The previous prime is 22121111197. The next prime is 22121111239. The reversal of 22121111211 is 11211112122.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 22121111211 - 2⁷ = 22121111083 is a prime.

It is a super-2 number, since 2×22121111211² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22121111261) 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, 3686851866 + ... + 3686851871.

It is an arithmetic number, because the mean of its divisors is an integer number (7373703738).

Almost surely, 2^22121111211 is an apocalyptic number.

22121111211 is a deficient number, since it is larger than the sum of its proper divisors (7373703741).

22121111211 is an equidigital number, since it uses as much as digits as its factorization.

22121111211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7373703740.

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

Adding to 22121111211 its reverse (11211112122), we get a palindrome (33332223333).

The spelling of 22121111211 in words is "twenty-two billion, one hundred twenty-one million, one hundred eleven thousand, two hundred eleven".