23870221 has 2 divisors, whose sum is σ = 23870222. Its totient is φ = 23870220.

The previous prime is 23870191. The next prime is 23870257. The reversal of 23870221 is 12207832.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21949225 + 1920996 = 4685^2 + 1386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23870221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23870281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11935110 + 11935111.

It is an arithmetic number, because the mean of its divisors is an integer number (11935111).

Almost surely, 2^23870221 is an apocalyptic number.

It is an amenable number.

23870221 is a deficient number, since it is larger than the sum of its proper divisors (1).

23870221 is an equidigital number, since it uses as much as digits as its factorization.

23870221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 23870221 is about 4885.7160171258. The cubic root of 23870221 is about 287.9290471109.

The spelling of 23870221 in words is "twenty-three million, eight hundred seventy thousand, two hundred twenty-one".