16221301 has 4 divisors (see below), whose sum is σ = 16237312. Its totient is φ = 16205292.

The previous prime is 16221253. The next prime is 16221311. The reversal of 16221301 is 10312261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10312261 = 661 ⋅15601.

It is a cyclic number.

It is not a de Polignac number, because 16221301 - 2¹⁵ = 16188533 is a prime.

It is a super-2 number, since 2×16221301² = 526261212265202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16221311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6375 + ... + 8548.

It is an arithmetic number, because the mean of its divisors is an integer number (4059328).

Almost surely, 2^16221301 is an apocalyptic number.

It is an amenable number.

16221301 is a deficient number, since it is larger than the sum of its proper divisors (16011).

16221301 is a wasteful number, since it uses less digits than its factorization.

16221301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16010.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 16221301 is about 4027.5676282342. The cubic root of 16221301 is about 253.1406520017.

Adding to 16221301 its reverse (10312261), we get a palindrome (26533562).

The spelling of 16221301 in words is "sixteen million, two hundred twenty-one thousand, three hundred one".