10821247 has 4 divisors (see below), whose sum is σ = 11291760. Its totient is φ = 10350736.

The previous prime is 10821229. The next prime is 10821257. The reversal of 10821247 is 74212801.

It is a happy number.

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

It is not a de Polignac number, because 10821247 - 2¹¹ = 10819199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10821257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 235222 + ... + 235267.

It is an arithmetic number, because the mean of its divisors is an integer number (2822940).

Almost surely, 2^10821247 is an apocalyptic number.

10821247 is a deficient number, since it is larger than the sum of its proper divisors (470513).

10821247 is an equidigital number, since it uses as much as digits as its factorization.

10821247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470512.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 10821247 is about 3289.5663847991. The cubic root of 10821247 is about 221.1867479610.

The spelling of 10821247 in words is "ten million, eight hundred twenty-one thousand, two hundred forty-seven".