21374074 has 4 divisors (see below), whose sum is σ = 32061114. Its totient is φ = 10687036.

The previous prime is 21374071. The next prime is 21374113. The reversal of 21374074 is 47047312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 10857025 + 10517049 = 3295^2 + 3243^2 .

It is not an unprimeable number, because it can be changed into a prime (21374071) 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 as a sum of consecutive naturals, namely, 5343517 + ... + 5343520.

Almost surely, 2^21374074 is an apocalyptic number.

21374074 is a deficient number, since it is larger than the sum of its proper divisors (10687040).

21374074 is a wasteful number, since it uses less digits than its factorization.

21374074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10687039.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 21374074 is about 4623.2103564515. The cubic root of 21374074 is about 277.5209474759.

The spelling of 21374074 in words is "twenty-one million, three hundred seventy-four thousand, seventy-four".