21740074 has 8 divisors (see below), whose sum is σ = 32826528. Its totient is φ = 10797900.

The previous prime is 21740063. The next prime is 21740101. The reversal of 21740074 is 47004712.

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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35692 + ... + 36295.

It is an arithmetic number, because the mean of its divisors is an integer number (4103316).

Almost surely, 2^21740074 is an apocalyptic number.

21740074 is a deficient number, since it is larger than the sum of its proper divisors (11086454).

21740074 is a wasteful number, since it uses less digits than its factorization.

21740074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72140.

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

The square root of 21740074 is about 4662.6252262004. The cubic root of 21740074 is about 279.0960388445.

Adding to 21740074 its reverse (47004712), we get a palindrome (68744786).

The spelling of 21740074 in words is "twenty-one million, seven hundred forty thousand, seventy-four".