23042221 has 2 divisors, whose sum is σ = 23042222. Its totient is φ = 23042220.

The previous prime is 23042213. The next prime is 23042237. The reversal of 23042221 is 12224032.

It is an a-pointer prime, because the next prime (23042237) can be obtained adding 23042221 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13586596 + 9455625 = 3686^2 + 3075^2 .

It is a cyclic number.

It is not a de Polignac number, because 23042221 - 2³ = 23042213 is a prime.

It is a super-2 number, since 2×23042221² = 1061887897225682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 23042195 and 23042204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23042291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11521110 + 11521111.

It is an arithmetic number, because the mean of its divisors is an integer number (11521111).

Almost surely, 2^23042221 is an apocalyptic number.

It is an amenable number.

23042221 is a deficient number, since it is larger than the sum of its proper divisors (1).

23042221 is an equidigital number, since it uses as much as digits as its factorization.

23042221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 23042221 is about 4800.2313485914. The cubic root of 23042221 is about 284.5606074219.

Adding to 23042221 its reverse (12224032), we get a palindrome (35266253).

The spelling of 23042221 in words is "twenty-three million, forty-two thousand, two hundred twenty-one".