221100037 has 2 divisors, whose sum is σ = 221100038. Its totient is φ = 221100036.

The previous prime is 221099999. The next prime is 221100041. The reversal of 221100037 is 730001122.

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., 187991521 + 33108516 = 13711^2 + 5754^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221100037 is a prime.

It is a super-2 number, since 2×221100037² = 97770452722802738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221100637) 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, 110550018 + 110550019.

It is an arithmetic number, because the mean of its divisors is an integer number (110550019).

Almost surely, 2^221100037 is an apocalyptic number.

It is an amenable number.

221100037 is a deficient number, since it is larger than the sum of its proper divisors (1).

221100037 is an equidigital number, since it uses as much as digits as its factorization.

221100037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 221100037 is about 14869.4329750667. The cubic root of 221100037 is about 604.6855702836.

Adding to 221100037 its reverse (730001122), we get a palindrome (951101159).

The spelling of 221100037 in words is "two hundred twenty-one million, one hundred thousand, thirty-seven".