16221474 has 12 divisors (see below), whose sum is σ = 35146566. Its totient is φ = 5407152.

The previous prime is 16221467. The next prime is 16221487. The reversal of 16221474 is 47412261.

16221474 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 12638025 + 3583449 = 3555^2 + 1893^2 .

It is a plaindrome in base 14.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 450579 + ... + 450614.

Almost surely, 2^16221474 is an apocalyptic number.

16221474 is an abundant number, since it is smaller than the sum of its proper divisors (18925092).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16221474 is a wasteful number, since it uses less digits than its factorization.

16221474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901201 (or 901198 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 16221474 is about 4027.5891051596. The cubic root of 16221474 is about 253.1415519126.

The spelling of 16221474 in words is "sixteen million, two hundred twenty-one thousand, four hundred seventy-four".