22191900 has 36 divisors (see below), whose sum is σ = 64209432. Its totient is φ = 5917760.

The previous prime is 22191893. The next prime is 22191901. The reversal of 22191900 is 919122.

It is a super-2 number, since 2×22191900² = 984960851220000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22191901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36687 + ... + 37286.

Almost surely, 2^22191900 is an apocalyptic number.

22191900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22191900 is an abundant number, since it is smaller than the sum of its proper divisors (42017532).

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

22191900 is a wasteful number, since it uses less digits than its factorization.

22191900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73990 (or 73983 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 22191900 is about 4710.8279527064. The cubic root of 22191900 is about 281.0162897983.

The spelling of 22191900 in words is "twenty-two million, one hundred ninety-one thousand, nine hundred".