21407074 has 8 divisors (see below), whose sum is σ = 34580700. Its totient is φ = 9880176.

The previous prime is 21407041. The next prime is 21407093. The reversal of 21407074 is 47070412.

It can be written as a sum of positive squares in 2 ways, for example, as 18003049 + 3404025 = 4243^2 + 1845^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 411649 + ... + 411700.

Almost surely, 2^21407074 is an apocalyptic number.

21407074 is a deficient number, since it is larger than the sum of its proper divisors (13173626).

21407074 is a wasteful number, since it uses less digits than its factorization.

21407074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823364.

The product of its (nonzero) digits is 1568, while the sum is 25.

The square root of 21407074 is about 4626.7779285373. Note that the first 3 decimals coincide. The cubic root of 21407074 is about 277.6636980205.

Adding to 21407074 its reverse (47070412), we get a palindrome (68477486).

The spelling of 21407074 in words is "twenty-one million, four hundred seven thousand, seventy-four".