21150272 has 56 divisors (see below), whose sum is σ = 49328832. Its totient is φ = 8870400.

The previous prime is 21150263. The next prime is 21150289. The reversal of 21150272 is 27205112.

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, 7997 + ... + 10307.

It is an arithmetic number, because the mean of its divisors is an integer number (880872).

Almost surely, 2^21150272 is an apocalyptic number.

21150272 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 21150272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24664416).

21150272 is an abundant number, since it is smaller than the sum of its proper divisors (28178560).

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

21150272 is a wasteful number, since it uses less digits than its factorization.

21150272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2347 (or 2337 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 21150272 is about 4598.9424871377. The cubic root of 21150272 is about 276.5489320187.

Adding to 21150272 its reverse (27205112), we get a palindrome (48355384).

The spelling of 21150272 in words is "twenty-one million, one hundred fifty thousand, two hundred seventy-two".