23037221 has 2 divisors, whose sum is σ = 23037222. Its totient is φ = 23037220.

The previous prime is 23037211. The next prime is 23037233. The reversal of 23037221 is 12273032.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22562500 + 474721 = 4750^2 + 689^2 .

It is a cyclic number.

It is not a de Polignac number, because 23037221 - 2¹⁰ = 23036197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 23037193 and 23037202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23037211) 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, 11518610 + 11518611.

It is an arithmetic number, because the mean of its divisors is an integer number (11518611).

Almost surely, 2^23037221 is an apocalyptic number.

It is an amenable number.

23037221 is a deficient number, since it is larger than the sum of its proper divisors (1).

23037221 is an equidigital number, since it uses as much as digits as its factorization.

23037221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 23037221 is about 4799.7105121038. The cubic root of 23037221 is about 284.5400233824.

The spelling of 23037221 in words is "twenty-three million, thirty-seven thousand, two hundred twenty-one".