21143074 has 4 divisors (see below), whose sum is σ = 31714614. Its totient is φ = 10571536.

The previous prime is 21143071. The next prime is 21143081. The reversal of 21143074 is 47034112.

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., 18105025 + 3038049 = 4255^2 + 1743^2 .

It is not an unprimeable number, because it can be changed into a prime (21143071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5285767 + ... + 5285770.

Almost surely, 2^21143074 is an apocalyptic number.

21143074 is a deficient number, since it is larger than the sum of its proper divisors (10571540).

21143074 is a wasteful number, since it uses less digits than its factorization.

21143074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10571539.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 21143074 is about 4598.1598493310. The cubic root of 21143074 is about 276.5175561405.

Adding to 21143074 its reverse (47034112), we get a palindrome (68177186).

The spelling of 21143074 in words is "twenty-one million, one hundred forty-three thousand, seventy-four".