22001121 has 6 divisors (see below), whose sum is σ = 31779410. Its totient is φ = 14667408.

The previous prime is 22001113. The next prime is 22001129. The reversal of 22001121 is 12110022.

It is an interprime number because it is at equal distance from previous prime (22001113) and next prime (22001129).

It can be written as a sum of positive squares in only one way, i.e., 21986721 + 14400 = 4689^2 + 120^2 .

It is not a de Polignac number, because 22001121 - 2³ = 22001113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 2444569 = 22001121 / (2 + 2 + 0 + 0 + 1 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22001129) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1222276 + ... + 1222293.

Almost surely, 2^22001121 is an apocalyptic number.

It is an amenable number.

22001121 is a deficient number, since it is larger than the sum of its proper divisors (9778289).

22001121 is a wasteful number, since it uses less digits than its factorization.

22001121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2444575 (or 2444572 counting only the distinct ones).

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

The square root of 22001121 is about 4690.5352573027. The cubic root of 22001121 is about 280.2086922061.

Adding to 22001121 its reverse (12110022), we get a palindrome (34111143).

It can be divided in two parts, 22001 and 121, that added together give a palindrome (22122).

The spelling of 22001121 in words is "twenty-two million, one thousand, one hundred twenty-one".