16221180 has 48 divisors (see below), whose sum is σ = 46285344. Its totient is φ = 4243200.

The previous prime is 16221151. The next prime is 16221197. The reversal of 16221180 is 8112261.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 630 + ... + 5730.

It is an arithmetic number, because the mean of its divisors is an integer number (964278).

Almost surely, 2^16221180 is an apocalyptic number.

16221180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16221180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23142672).

16221180 is an abundant number, since it is smaller than the sum of its proper divisors (30064164).

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

16221180 is a wasteful number, since it uses less digits than its factorization.

16221180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5166 (or 5164 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 16221180 is about 4027.5526067328. The cubic root of 16221180 is about 253.1400225804.

The spelling of 16221180 in words is "sixteen million, two hundred twenty-one thousand, one hundred eighty".