21567034 has 4 divisors (see below), whose sum is σ = 32350554. Its totient is φ = 10783516.

The previous prime is 21567011. The next prime is 21567083. The reversal of 21567034 is 43076512.

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., 20729809 + 837225 = 4553^2 + 915^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21566993 and 21567011.

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 as a sum of consecutive naturals, namely, 5391757 + ... + 5391760.

Almost surely, 2^21567034 is an apocalyptic number.

21567034 is a deficient number, since it is larger than the sum of its proper divisors (10783520).

21567034 is a wasteful number, since it uses less digits than its factorization.

21567034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10783519.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 21567034 is about 4644.0320842992. The cubic root of 21567034 is about 278.3535776766.

The spelling of 21567034 in words is "twenty-one million, five hundred sixty-seven thousand, thirty-four".