22571321 has 2 divisors, whose sum is σ = 22571322. Its totient is φ = 22571320.

The previous prime is 22571299. The next prime is 22571347. The reversal of 22571321 is 12317522.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21724921 + 846400 = 4661^2 + 920^2 .

It is a cyclic number.

It is not a de Polignac number, because 22571321 - 2¹⁰ = 22570297 is a prime.

It is a super-3 number, since 3×22571321³ (a number of 23 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22571621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11285660 + 11285661.

It is an arithmetic number, because the mean of its divisors is an integer number (11285661).

Almost surely, 2^22571321 is an apocalyptic number.

It is an amenable number.

22571321 is a deficient number, since it is larger than the sum of its proper divisors (1).

22571321 is an equidigital number, since it uses as much as digits as its factorization.

22571321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 840, while the sum is 23.

The square root of 22571321 is about 4750.9284355797. The cubic root of 22571321 is about 282.6087857326.

Adding to 22571321 its reverse (12317522), we get a palindrome (34888843).

The spelling of 22571321 in words is "twenty-two million, five hundred seventy-one thousand, three hundred twenty-one".