21574272 has 64 divisors (see below), whose sum is σ = 60343200. Its totient is φ = 6810624.

The previous prime is 21574271. The next prime is 21574283. The reversal of 21574272 is 27247512.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (21574271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5818 + ... + 8774.

Almost surely, 2^21574272 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 21574272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30171600).

21574272 is an abundant number, since it is smaller than the sum of its proper divisors (38768928).

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

21574272 is a wasteful number, since it uses less digits than its factorization.

21574272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2993 (or 2981 counting only the distinct ones).

The product of its digits is 7840, while the sum is 30.

The square root of 21574272 is about 4644.8112986428. The cubic root of 21574272 is about 278.3847131255.

The spelling of 21574272 in words is "twenty-one million, five hundred seventy-four thousand, two hundred seventy-two".