21067234 has 4 divisors (see below), whose sum is σ = 31600854. Its totient is φ = 10533616.

The previous prime is 21067229. The next prime is 21067247. The reversal of 21067234 is 43276012.

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., 15186609 + 5880625 = 3897^2 + 2425^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21067199 and 21067208.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5266807 + ... + 5266810.

Almost surely, 2^21067234 is an apocalyptic number.

21067234 is a deficient number, since it is larger than the sum of its proper divisors (10533620).

21067234 is a wasteful number, since it uses less digits than its factorization.

21067234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10533619.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 21067234 is about 4589.9056635186. The cubic root of 21067234 is about 276.1865381136.

The spelling of 21067234 in words is "twenty-one million, sixty-seven thousand, two hundred thirty-four".