16221894 has 16 divisors (see below), whose sum is σ = 34939632. Its totient is φ = 4991328.

The previous prime is 16221889. The next prime is 16221901. The reversal of 16221894 is 49812261.

It is a plaindrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103909 + ... + 104064.

It is an arithmetic number, because the mean of its divisors is an integer number (2183727).

Almost surely, 2^16221894 is an apocalyptic number.

16221894 is an abundant number, since it is smaller than the sum of its proper divisors (18717738).

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

16221894 is a wasteful number, since it uses less digits than its factorization.

16221894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207991.

The product of its digits is 6912, while the sum is 33.

The square root of 16221894 is about 4027.6412451955. The cubic root of 16221894 is about 253.1437366408.

The spelling of 16221894 in words is "sixteen million, two hundred twenty-one thousand, eight hundred ninety-four".