16450421 has 8 divisors (see below), whose sum is σ = 17766840. Its totient is φ = 15141312.

The previous prime is 16450417. The next prime is 16450433. The reversal of 16450421 is 12405461.

It can be written as a sum of positive squares in 4 ways, for example, as 2686321 + 13764100 = 1639^2 + 3710^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16450421 - 2² = 16450417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16450411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3431 + ... + 6683.

It is an arithmetic number, because the mean of its divisors is an integer number (2220855).

Almost surely, 2^16450421 is an apocalyptic number.

It is an amenable number.

16450421 is a deficient number, since it is larger than the sum of its proper divisors (1316419).

16450421 is a wasteful number, since it uses less digits than its factorization.

16450421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3655.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 16450421 is about 4055.9118580166. The cubic root of 16450421 is about 254.3269241890.

Adding to 16450421 its reverse (12405461), we get a palindrome (28855882).

The spelling of 16450421 in words is "sixteen million, four hundred fifty thousand, four hundred twenty-one".