22101220121 has 4 divisors (see below), whose sum is σ = 22103462244. Its totient is φ = 22098978000.

The previous prime is 22101220111. The next prime is 22101220129. The reversal of 22101220121 is 12102210122.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21188878096 + 912342025 = 145564^2 + 30205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22101220121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22101220096 and 22101220105.

It is not an unprimeable number, because it can be changed into a prime (22101220129) 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, 1106210 + ... + 1126011.

It is an arithmetic number, because the mean of its divisors is an integer number (5525865561).

Almost surely, 2^22101220121 is an apocalyptic number.

It is an amenable number.

22101220121 is a deficient number, since it is larger than the sum of its proper divisors (2242123).

22101220121 is an equidigital number, since it uses as much as digits as its factorization.

22101220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2242122.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 22101220121 its reverse (12102210122), we get a palindrome (34203430243).

Subtracting from 22101220121 its reverse (12102210122), we obtain a palindrome (9999009999).

The spelling of 22101220121 in words is "twenty-two billion, one hundred one million, two hundred twenty thousand, one hundred twenty-one".