21193272 has 64 divisors (see below), whose sum is σ = 59904000. Its totient is φ = 6940512.

The previous prime is 21193259. The next prime is 21193279. The reversal of 21193272 is 27239112.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21193279) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11913 + ... + 13575.

It is an arithmetic number, because the mean of its divisors is an integer number (936000).

Almost surely, 2^21193272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21193272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29952000).

21193272 is an abundant number, since it is smaller than the sum of its proper divisors (38710728).

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

21193272 is a wasteful number, since it uses less digits than its factorization.

21193272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1737 (or 1727 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 21193272 is about 4603.6151012004. The cubic root of 21193272 is about 276.7362196706.

The spelling of 21193272 in words is "twenty-one million, one hundred ninety-three thousand, two hundred seventy-two".