21072074 has 8 divisors (see below), whose sum is σ = 32280768. Its totient is φ = 10311820.

The previous prime is 21072053. The next prime is 21072101. The reversal of 21072074 is 47027012.

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

It is a super-2 number, since 2×21072074² = 888064605322952, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111992 + ... + 112179.

It is an arithmetic number, because the mean of its divisors is an integer number (4035096).

Almost surely, 2^21072074 is an apocalyptic number.

21072074 is a deficient number, since it is larger than the sum of its proper divisors (11208694).

21072074 is a wasteful number, since it uses less digits than its factorization.

21072074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224220.

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 21072074 is about 4590.4328771914. The cubic root of 21072074 is about 276.2076869189.

Adding to 21072074 its reverse (47027012), we get a palindrome (68099086).

The spelling of 21072074 in words is "twenty-one million, seventy-two thousand, seventy-four".