22121321 has 8 divisors (see below), whose sum is σ = 22977024. Its totient is φ = 21274560.

The previous prime is 22121303. The next prime is 22121329. The reversal of 22121321 is 12312122.

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 22121321 - 2¹⁴ = 22104937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22121296 and 22121305.

It is not an unprimeable number, because it can be changed into a prime (22121329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3041 + ... + 7313.

It is an arithmetic number, because the mean of its divisors is an integer number (2872128).

Almost surely, 2^22121321 is an apocalyptic number.

It is an amenable number.

22121321 is a deficient number, since it is larger than the sum of its proper divisors (855703).

22121321 is a wasteful number, since it uses less digits than its factorization.

22121321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4471.

The product of its digits is 48, while the sum is 14.

The square root of 22121321 is about 4703.3308410104. The cubic root of 22121321 is about 280.7180591761.

Adding to 22121321 its reverse (12312122), we get a palindrome (34433443).

The spelling of 22121321 in words is "twenty-two million, one hundred twenty-one thousand, three hundred twenty-one".