22021121 has 8 divisors (see below), whose sum is σ = 22921920. Its totient is φ = 21129808.

The previous prime is 22021093. The next prime is 22021123. The reversal of 22021121 is 12112022.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22021121 - 2¹⁸ = 21758977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22021123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2570 + ... + 7116.

It is an arithmetic number, because the mean of its divisors is an integer number (2865240).

Almost surely, 2^22021121 is an apocalyptic number.

It is an amenable number.

22021121 is a deficient number, since it is larger than the sum of its proper divisors (900799).

22021121 is a wasteful number, since it uses less digits than its factorization.

22021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4743.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 22021121 is about 4692.6667258607. Note that the first 3 decimals coincide. The cubic root of 22021121 is about 280.2935738893.

Adding to 22021121 its reverse (12112022), we get a palindrome (34133143).

Subtracting from 22021121 its reverse (12112022), we obtain a palindrome (9909099).

The spelling of 22021121 in words is "twenty-two million, twenty-one thousand, one hundred twenty-one".