1682684021 has 4 divisors (see below), whose sum is σ = 1781665452. Its totient is φ = 1583702592.

The previous prime is 1682684011. The next prime is 1682684027. The reversal of 1682684021 is 1204862861.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1422345796 + 260338225 = 37714^2 + 16135^2 .

It is not a de Polignac number, because 1682684021 - 2⁶ = 1682683957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1682684027) 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, 49490690 + ... + 49490723.

It is an arithmetic number, because the mean of its divisors is an integer number (445416363).

Almost surely, 2^1682684021 is an apocalyptic number.

It is an amenable number.

1682684021 is a deficient number, since it is larger than the sum of its proper divisors (98981431).

1682684021 is an equidigital number, since it uses as much as digits as its factorization.

1682684021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98981430.

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 1682684021 is about 41020.5317006009. The cubic root of 1682684021 is about 1189.4171335240.

The spelling of 1682684021 in words is "one billion, six hundred eighty-two million, six hundred eighty-four thousand, twenty-one".