21646034 has 4 divisors (see below), whose sum is σ = 32469054. Its totient is φ = 10823016.

The previous prime is 21646021. The next prime is 21646043. The reversal of 21646034 is 43064612.

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., 14100025 + 7546009 = 3755^2 + 2747^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21645994 and 21646012.

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, 5411507 + ... + 5411510.

Almost surely, 2^21646034 is an apocalyptic number.

21646034 is a deficient number, since it is larger than the sum of its proper divisors (10823020).

21646034 is a wasteful number, since it uses less digits than its factorization.

21646034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10823019.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 21646034 is about 4652.5298494475. The cubic root of 21646034 is about 278.6930330610.

The spelling of 21646034 in words is "twenty-one million, six hundred forty-six thousand, thirty-four".