22100121 has 12 divisors (see below), whose sum is σ = 33105072. Its totient is φ = 14733252.

The previous prime is 22100081. The next prime is 22100129. The reversal of 22100121 is 12100122.

It is a de Polignac number, because none of the positive numbers 2^k-22100121 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22100129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45231 + ... + 45716.

It is an arithmetic number, because the mean of its divisors is an integer number (2758756).

Almost surely, 2^22100121 is an apocalyptic number.

It is an amenable number.

22100121 is a deficient number, since it is larger than the sum of its proper divisors (11004951).

22100121 is an frugal number, since it uses more digits than its factorization.

22100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90962 (or 90950 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 22100121 is about 4701.0765788274. The cubic root of 22100121 is about 280.6283549945.

Adding to 22100121 its reverse (12100122), we get a palindrome (34200243).

Subtracting from 22100121 its reverse (12100122), we obtain a palindrome (9999999).

The spelling of 22100121 in words is "twenty-two million, one hundred thousand, one hundred twenty-one".