10427821 has 4 divisors (see below), whose sum is σ = 10709692. Its totient is φ = 10145952.

The previous prime is 10427819. The next prime is 10427839. The reversal of 10427821 is 12872401.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12872401 = 41 ⋅313961.

It can be written as a sum of positive squares in 2 ways, for example, as 6702921 + 3724900 = 2589^2 + 1930^2 .

It is a cyclic number.

It is not a de Polignac number, because 10427821 - 2¹ = 10427819 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 (10427861) 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, 140880 + ... + 140953.

It is an arithmetic number, because the mean of its divisors is an integer number (2677423).

Almost surely, 2^10427821 is an apocalyptic number.

It is an amenable number.

10427821 is a deficient number, since it is larger than the sum of its proper divisors (281871).

10427821 is an equidigital number, since it uses as much as digits as its factorization.

10427821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281870.

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

The square root of 10427821 is about 3229.2136813782. The cubic root of 10427821 is about 218.4730420375.

The spelling of 10427821 in words is "ten million, four hundred twenty-seven thousand, eight hundred twenty-one".