23012221 has 2 divisors, whose sum is σ = 23012222. Its totient is φ = 23012220.

The previous prime is 23012219. The next prime is 23012233. The reversal of 23012221 is 12221032.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22944100 + 68121 = 4790^2 + 261^2 .

It is a cyclic number.

It is not a de Polignac number, because 23012221 - 2¹ = 23012219 is a prime.

Together with 23012219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23012251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11506110 + 11506111.

It is an arithmetic number, because the mean of its divisors is an integer number (11506111).

Almost surely, 2^23012221 is an apocalyptic number.

It is an amenable number.

23012221 is a deficient number, since it is larger than the sum of its proper divisors (1).

23012221 is an equidigital number, since it uses as much as digits as its factorization.

23012221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 23012221 is about 4797.1054814336. The cubic root of 23012221 is about 284.4370584845.

Adding to 23012221 its reverse (12221032), we get a palindrome (35233253).

The spelling of 23012221 in words is "twenty-three million, twelve thousand, two hundred twenty-one".