10687821 has 8 divisors (see below), whose sum is σ = 14519520. Its totient is φ = 6990672.

The previous prime is 10687819. The next prime is 10687829. The reversal of 10687821 is 12878601.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 10687821 - 2¹ = 10687819 is a prime.

It is a super-2 number, since 2×10687821² = 228459035456082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10687829) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 33451 + ... + 33768.

It is an arithmetic number, because the mean of its divisors is an integer number (1814940).

Almost surely, 2^10687821 is an apocalyptic number.

It is an amenable number.

10687821 is a deficient number, since it is larger than the sum of its proper divisors (3831699).

10687821 is an equidigital number, since it uses as much as digits as its factorization.

10687821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67275.

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 10687821 is about 3269.2233022539. The cubic root of 10687821 is about 220.2739081440.

The spelling of 10687821 in words is "ten million, six hundred eighty-seven thousand, eight hundred twenty-one".