23100221 has 2 divisors, whose sum is σ = 23100222. Its totient is φ = 23100220.

The previous prime is 23100199. The next prime is 23100241. The reversal of 23100221 is 12200132.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16924996 + 6175225 = 4114^2 + 2485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23100221 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23100241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11550110 + 11550111.

It is an arithmetic number, because the mean of its divisors is an integer number (11550111).

Almost surely, 2^23100221 is an apocalyptic number.

It is an amenable number.

23100221 is a deficient number, since it is larger than the sum of its proper divisors (1).

23100221 is an equidigital number, since it uses as much as digits as its factorization.

23100221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 23100221 is about 4806.2689271409. The cubic root of 23100221 is about 284.7991649612.

Adding to 23100221 its reverse (12200132), we get a palindrome (35300353).

The spelling of 23100221 in words is "twenty-three million, one hundred thousand, two hundred twenty-one".