16450921 has 2 divisors, whose sum is σ = 16450922. Its totient is φ = 16450920.

The previous prime is 16450891. The next prime is 16450937. The reversal of 16450921 is 12905461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16160400 + 290521 = 4020^2 + 539^2 .

It is a cyclic number.

It is not a de Polignac number, because 16450921 - 2¹³ = 16442729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16450921.

It is not a weakly prime, because it can be changed into another prime (16450961) 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, 8225460 + 8225461.

It is an arithmetic number, because the mean of its divisors is an integer number (8225461).

Almost surely, 2^16450921 is an apocalyptic number.

It is an amenable number.

16450921 is a deficient number, since it is larger than the sum of its proper divisors (1).

16450921 is an equidigital number, since it uses as much as digits as its factorization.

16450921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 16450921 is about 4055.9734959686. The cubic root of 16450921 is about 254.3295008642.

It can be divided in two parts, 16450 and 921, that added together give a palindrome (17371).

The spelling of 16450921 in words is "sixteen million, four hundred fifty thousand, nine hundred twenty-one".