16752221 has 2 divisors, whose sum is σ = 16752222. Its totient is φ = 16752220.

The previous prime is 16752199. The next prime is 16752251. The reversal of 16752221 is 12225761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15100996 + 1651225 = 3886^2 + 1285^2 .

It is an emirp because it is prime and its reverse (12225761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16752221 - 2¹⁰ = 16751197 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 (16752251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8376110 + 8376111.

It is an arithmetic number, because the mean of its divisors is an integer number (8376111).

Almost surely, 2^16752221 is an apocalyptic number.

It is an amenable number.

16752221 is a deficient number, since it is larger than the sum of its proper divisors (1).

16752221 is an equidigital number, since it uses as much as digits as its factorization.

16752221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 26.

The square root of 16752221 is about 4092.9477152781. The cubic root of 16752221 is about 255.8728056694.

Adding to 16752221 its reverse (12225761), we get a palindrome (28977982).

The spelling of 16752221 in words is "sixteen million, seven hundred fifty-two thousand, two hundred twenty-one".