22121121212111 has 4 divisors (see below), whose sum is σ = 22121275191672. Its totient is φ = 22120967232552.

The previous prime is 22121121212077. The next prime is 22121121212123. The reversal of 22121121212111 is 11121212112122.

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 22121121212111 - 2³⁴ = 22103941342927 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 (22121121214111) 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, 76774085 + ... + 77061678.

It is an arithmetic number, because the mean of its divisors is an integer number (5530318797918).

Almost surely, 2^{22121121212111} is an apocalyptic number.

22121121212111 is a deficient number, since it is larger than the sum of its proper divisors (153979561).

22121121212111 is a wasteful number, since it uses less digits than its factorization.

22121121212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153979560.

The product of its digits is 64, while the sum is 20.

Adding to 22121121212111 its reverse (11121212112122), we get a palindrome (33242333324233).

The spelling of 22121121212111 in words is "twenty-two trillion, one hundred twenty-one billion, one hundred twenty-one million, two hundred twelve thousand, one hundred eleven".