10921387 has 4 divisors (see below), whose sum is σ = 10956816. Its totient is φ = 10885960.

The previous prime is 10921373. The next prime is 10921403. The reversal of 10921387 is 78312901.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10921387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10921307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17248 + ... + 17869.

It is an arithmetic number, because the mean of its divisors is an integer number (2739204).

Almost surely, 2^10921387 is an apocalyptic number.

10921387 is a deficient number, since it is larger than the sum of its proper divisors (35429).

10921387 is an equidigital number, since it uses as much as digits as its factorization.

10921387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35428.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 10921387 is about 3304.7521843551. The cubic root of 10921387 is about 221.8669426949.

The spelling of 10921387 in words is "ten million, nine hundred twenty-one thousand, three hundred eighty-seven".