4021381 has 24 divisors (see below), whose sum is σ = 5171040. Its totient is φ = 3098592.

The previous prime is 4021379. The next prime is 4021387. The reversal of 4021381 is 1831204.

It is not a de Polignac number, because 4021381 - 2¹ = 4021379 is a prime.

It is a super-2 number, since 2×4021381² = 32343010294322, which contains 22 as substring.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021387) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37530 + ... + 37636.

It is an arithmetic number, because the mean of its divisors is an integer number (215460).

Almost surely, 2^4021381 is an apocalyptic number.

It is an amenable number.

4021381 is a deficient number, since it is larger than the sum of its proper divisors (1149659).

4021381 is a wasteful number, since it uses less digits than its factorization.

4021381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193 (or 186 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 4021381 is about 2005.3381261024. The cubic root of 4021381 is about 159.0224379289.

Adding to 4021381 its reverse (1831204), we get a palindrome (5852585).

The spelling of 4021381 in words is "four million, twenty-one thousand, three hundred eighty-one".