21911074 has 8 divisors (see below), whose sum is σ = 32896080. Its totient is φ = 10945716.

The previous prime is 21911059. The next prime is 21911107. The reversal of 21911074 is 47011912.

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, 1704 + ... + 6835.

It is an arithmetic number, because the mean of its divisors is an integer number (4112010).

Almost surely, 2^21911074 is an apocalyptic number.

21911074 is a deficient number, since it is larger than the sum of its proper divisors (10985006).

21911074 is a wasteful number, since it uses less digits than its factorization.

21911074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9824.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 21911074 is about 4680.9266176688. The cubic root of 21911074 is about 279.8258866509.

Adding to 21911074 its reverse (47011912), we get a palindrome (68922986).

The spelling of 21911074 in words is "twenty-one million, nine hundred eleven thousand, seventy-four".