21194272 has 48 divisors (see below), whose sum is σ = 47930400. Its totient is φ = 9123840.

The previous prime is 21194269. The next prime is 21194323. The reversal of 21194272 is 27249112.

It is a self number, because there is not a number n which added to its sum of digits gives 21194272.

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, 5104 + ... + 8272.

It is an arithmetic number, because the mean of its divisors is an integer number (998550).

Almost surely, 2^21194272 is an apocalyptic number.

21194272 is a gapful number since it is divisible by the number (22) 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 21194272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23965200).

21194272 is an abundant number, since it is smaller than the sum of its proper divisors (26736128).

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

21194272 is a wasteful number, since it uses less digits than its factorization.

21194272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3209 (or 3201 counting only the distinct ones).

The product of its digits is 2016, while the sum is 28.

The square root of 21194272 is about 4603.7237102155. The cubic root of 21194272 is about 276.7405721819.

The spelling of 21194272 in words is "twenty-one million, one hundred ninety-four thousand, two hundred seventy-two".