22121201111 has 4 divisors (see below), whose sum is σ = 22138127592. Its totient is φ = 22104274632.

The previous prime is 22121201107. The next prime is 22121201191. The reversal of 22121201111 is 11110212122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11110212122 = 2 ⋅5555106061.

It is a cyclic number.

It is not a de Polignac number, because 22121201111 - 2² = 22121201107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121201191) 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, 8461280 + ... + 8463893.

It is an arithmetic number, because the mean of its divisors is an integer number (5534531898).

Almost surely, 2^22121201111 is an apocalyptic number.

22121201111 is a deficient number, since it is larger than the sum of its proper divisors (16926481).

22121201111 is a wasteful number, since it uses less digits than its factorization.

22121201111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16926480.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 22121201111 its reverse (11110212122), we get a palindrome (33231413233).

The spelling of 22121201111 in words is "twenty-two billion, one hundred twenty-one million, two hundred one thousand, one hundred eleven".