221023037 has 2 divisors, whose sum is σ = 221023038. Its totient is φ = 221023036.

The previous prime is 221023013. The next prime is 221023039. The reversal of 221023037 is 730320122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197655481 + 23367556 = 14059^2 + 4834^2 .

It is a cyclic number.

It is not a de Polignac number, because 221023037 - 2⁶ = 221022973 is a prime.

Together with 221023039, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221023039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110511518 + 110511519.

It is an arithmetic number, because the mean of its divisors is an integer number (110511519).

Almost surely, 2^221023037 is an apocalyptic number.

It is an amenable number.

221023037 is a deficient number, since it is larger than the sum of its proper divisors (1).

221023037 is an equidigital number, since it uses as much as digits as its factorization.

221023037 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 221023037 is about 14866.8435452856. The cubic root of 221023037 is about 604.6153664736.

Adding to 221023037 its reverse (730320122), we get a palindrome (951343159).

The spelling of 221023037 in words is "two hundred twenty-one million, twenty-three thousand, thirty-seven".