381021 has 16 divisors (see below), whose sum is σ = 557568. Its totient is φ = 230400.

The previous prime is 381019. The next prime is 381037. The reversal of 381021 is 120183.

It is a happy number.

381021 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 381021 - 2¹ = 381019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1461 + ... + 1701.

It is an arithmetic number, because the mean of its divisors is an integer number (34848).

2³⁸¹⁰²¹ is an apocalyptic number.

381021 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

381021 is a deficient number, since it is larger than the sum of its proper divisors (176547).

381021 is a wasteful number, since it uses less digits than its factorization.

381021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 381021 is about 617.2689851272. The cubic root of 381021 is about 72.4963771475.

The spelling of 381021 in words is "three hundred eighty-one thousand, twenty-one".