22191400 has 144 divisors (see below), whose sum is σ = 65308320. Its totient is φ = 6864000.

The previous prime is 22191391. The next prime is 22191401. The reversal of 22191400 is 419122.

It is not an unprimeable number, because it can be changed into a prime (22191401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 169335 + ... + 169465.

It is an arithmetic number, because the mean of its divisors is an integer number (453530).

Almost surely, 2^22191400 is an apocalyptic number.

22191400 is a gapful number since it is divisible by the number (20) 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 22191400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32654160).

22191400 is an abundant number, since it is smaller than the sum of its proper divisors (43116920).

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

22191400 is a wasteful number, since it uses less digits than its factorization.

22191400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176 (or 156 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 22191400 is about 4710.7748831800. The cubic root of 22191400 is about 281.0141792805.

The spelling of 22191400 in words is "twenty-two million, one hundred ninety-one thousand, four hundred".