16221485 has 32 divisors (see below), whose sum is σ = 23846400. Its totient is φ = 10340352.

The previous prime is 16221467. The next prime is 16221487. The reversal of 16221485 is 58412261.

It is a de Polignac number, because none of the positive numbers 2^k-16221485 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16221487) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81416 + ... + 81614.

It is an arithmetic number, because the mean of its divisors is an integer number (745200).

Almost surely, 2^16221485 is an apocalyptic number.

It is an amenable number.

16221485 is a deficient number, since it is larger than the sum of its proper divisors (7624915).

16221485 is a wasteful number, since it uses less digits than its factorization.

16221485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365.

The product of its digits is 3840, while the sum is 29.

The square root of 16221485 is about 4027.5904707405. The cubic root of 16221485 is about 253.1416091322.

The spelling of 16221485 in words is "sixteen million, two hundred twenty-one thousand, four hundred eighty-five".