21714472 has 24 divisors (see below), whose sum is σ = 44090190. Its totient is φ = 10021440.

The previous prime is 21714443. The next prime is 21714479. The reversal of 21714472 is 27441712.

It can be written as a sum of positive squares in 3 ways, for example, as 4024036 + 17690436 = 2006^2 + 4206^2 .

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21714472.

It is not an unprimeable number, because it can be changed into a prime (21714479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6679 + ... + 9382.

Almost surely, 2^21714472 is an apocalyptic number.

It is an amenable number.

21714472 is an abundant number, since it is smaller than the sum of its proper divisors (22375718).

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

21714472 is a wasteful number, since it uses less digits than its factorization.

21714472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16093 (or 16076 counting only the distinct ones).

The product of its digits is 3136, while the sum is 28.

The square root of 21714472 is about 4659.8789683853. The cubic root of 21714472 is about 278.9864375074.

The spelling of 21714472 in words is "twenty-one million, seven hundred fourteen thousand, four hundred seventy-two".