21111074 has 4 divisors (see below), whose sum is σ = 31666614. Its totient is φ = 10555536.

The previous prime is 21111073. The next prime is 21111113. The reversal of 21111074 is 47011112.

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., 14115049 + 6996025 = 3757^2 + 2645^2 .

It is not an unprimeable number, because it can be changed into a prime (21111073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5277767 + ... + 5277770.

Almost surely, 2^21111074 is an apocalyptic number.

21111074 is a deficient number, since it is larger than the sum of its proper divisors (10555540).

21111074 is a wasteful number, since it uses less digits than its factorization.

21111074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10555539.

The product of its (nonzero) digits is 56, while the sum is 17.

The square root of 21111074 is about 4594.6788788772. The cubic root of 21111074 is about 276.3779827803.

Adding to 21111074 its reverse (47011112), we get a palindrome (68122186).

The spelling of 21111074 in words is "twenty-one million, one hundred eleven thousand, seventy-four".