3186682021 has 4 divisors (see below), whose sum is σ = 3187342444. Its totient is φ = 3186021600.

The previous prime is 3186682001. The next prime is 3186682043. The reversal of 3186682021 is 1202866813.

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 1668722500 + 1517959521 = 40850^2 + 38961^2 .

It is a cyclic number.

It is not a de Polignac number, because 3186682021 - 2⁵ = 3186681989 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 (3186682001) 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, 322920 + ... + 332641.

It is an arithmetic number, because the mean of its divisors is an integer number (796835611).

Almost surely, 2^3186682021 is an apocalyptic number.

It is an amenable number.

3186682021 is a deficient number, since it is larger than the sum of its proper divisors (660423).

3186682021 is an equidigital number, since it uses as much as digits as its factorization.

3186682021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660422.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 3186682021 is about 56450.7043445872. The cubic root of 3186682021 is about 1471.5654295512.

The spelling of 3186682021 in words is "three billion, one hundred eighty-six million, six hundred eighty-two thousand, twenty-one".