6381021 has 4 divisors (see below), whose sum is σ = 8508032. Its totient is φ = 4254012.

The previous prime is 6381007. The next prime is 6381031. The reversal of 6381021 is 1201836.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 6381021 - 2⁵ = 6380989 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6381031) 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, 1063501 + ... + 1063506.

It is an arithmetic number, because the mean of its divisors is an integer number (2127008).

Almost surely, 2^6381021 is an apocalyptic number.

It is an amenable number.

6381021 is a deficient number, since it is larger than the sum of its proper divisors (2127011).

6381021 is a wasteful number, since it uses less digits than its factorization.

6381021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2127010.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 6381021 is about 2526.0682888631. The cubic root of 6381021 is about 185.4798451425.

Adding to 6381021 its reverse (1201836), we get a palindrome (7582857).

The spelling of 6381021 in words is "six million, three hundred eighty-one thousand, twenty-one".