21347246 has 4 divisors (see below), whose sum is σ = 32020872. Its totient is φ = 10673622.

The previous prime is 21347239. The next prime is 21347267. The reversal of 21347246 is 64274312.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5336810 + ... + 5336813.

It is an arithmetic number, because the mean of its divisors is an integer number (8005218).

Almost surely, 2^21347246 is an apocalyptic number.

21347246 is a deficient number, since it is larger than the sum of its proper divisors (10673626).

21347246 is a wasteful number, since it uses less digits than its factorization.

21347246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10673625.

The product of its digits is 8064, while the sum is 29.

The square root of 21347246 is about 4620.3079983914. The cubic root of 21347246 is about 277.4047872905.

The spelling of 21347246 in words is "twenty-one million, three hundred forty-seven thousand, two hundred forty-six".