16621241 has 24 divisors (see below), whose sum is σ = 21115080. Its totient is φ = 12966912.

The previous prime is 16621229. The next prime is 16621259. The reversal of 16621241 is 14212661.

16621241 = 365² + 366² + ... + 461².

It can be written as a sum of positive squares in 4 ways, for example, as 137641 + 16483600 = 371^2 + 4060^2 .

It is not a de Polignac number, because 16621241 - 2¹⁴ = 16604857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16621271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61655 + ... + 61923.

It is an arithmetic number, because the mean of its divisors is an integer number (879795).

Almost surely, 2^16621241 is an apocalyptic number.

It is an amenable number.

16621241 is a deficient number, since it is larger than the sum of its proper divisors (4493839).

16621241 is a wasteful number, since it uses less digits than its factorization.

16621241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393 (or 386 counting only the distinct ones).

The product of its digits is 576, while the sum is 23.

The square root of 16621241 is about 4076.9156233604. The cubic root of 16621241 is about 255.2041988627.

The spelling of 16621241 in words is "sixteen million, six hundred twenty-one thousand, two hundred forty-one".