21294272 has 28 divisors (see below), whose sum is σ = 43622976. Its totient is φ = 10302720.

The previous prime is 21294271. The next prime is 21294283. The reversal of 21294272 is 27249212.

It is not an unprimeable number, because it can be changed into a prime (21294271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3383 + ... + 7350.

Almost surely, 2^21294272 is an apocalyptic number.

It is an amenable number.

21294272 is an abundant number, since it is smaller than the sum of its proper divisors (22328704).

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

21294272 is a wasteful number, since it uses less digits than its factorization.

21294272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10776 (or 10766 counting only the distinct ones).

The product of its digits is 4032, while the sum is 29.

The square root of 21294272 is about 4614.5717027694. The cubic root of 21294272 is about 277.1751337232.

The spelling of 21294272 in words is "twenty-one million, two hundred ninety-four thousand, two hundred seventy-two".