16221880 has 32 divisors (see below), whose sum is σ = 36645840. Its totient is φ = 6462720.

The previous prime is 16221871. The next prime is 16221889. The reversal of 16221880 is 8812261.

It is an interprime number because it is at equal distance from previous prime (16221871) and next prime (16221889).

It is a super-3 number, since 3×16221880³ (a number of 23 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16221889) 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, 11620 + ... + 12940.

Almost surely, 2^16221880 is an apocalyptic number.

16221880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16221880 is an abundant number, since it is smaller than the sum of its proper divisors (20423960).

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

16221880 is a wasteful number, since it uses less digits than its factorization.

16221880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1639 (or 1635 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 16221880 is about 4027.6395072052. The cubic root of 16221880 is about 253.1436638171.

The spelling of 16221880 in words is "sixteen million, two hundred twenty-one thousand, eight hundred eighty".