21414724 has 6 divisors (see below), whose sum is σ = 37475774. Its totient is φ = 10707360.

The previous prime is 21414719. The next prime is 21414733. The reversal of 21414724 is 42741412.

It can be written as a sum of positive squares in only one way, i.e., 11289600 + 10125124 = 3360^2 + 3182^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2676837 + ... + 2676844.

Almost surely, 2^21414724 is an apocalyptic number.

It is an amenable number.

21414724 is a deficient number, since it is larger than the sum of its proper divisors (16061050).

21414724 is a wasteful number, since it uses less digits than its factorization.

21414724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5353685 (or 5353683 counting only the distinct ones).

The product of its digits is 1792, while the sum is 25.

The square root of 21414724 is about 4627.6045639186. The cubic root of 21414724 is about 277.6967692429.

The spelling of 21414724 in words is "twenty-one million, four hundred fourteen thousand, seven hundred twenty-four".