2021239 has 12 divisors (see below), whose sum is σ = 2331720. Its totient is φ = 1737360.

The previous prime is 2021237. The next prime is 2021251. The reversal of 2021239 is 9321202.

It is a happy number.

It is not a de Polignac number, because 2021239 - 2¹ = 2021237 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021237) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3717 + ... + 4225.

It is an arithmetic number, because the mean of its divisors is an integer number (194310).

2^2021239 is an apocalyptic number.

2021239 is a deficient number, since it is larger than the sum of its proper divisors (310481).

2021239 is a wasteful number, since it uses less digits than its factorization.

2021239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558 (or 539 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 2021239 is about 1421.7028522163. The cubic root of 2021239 is about 126.4365265571.

It can be divided in two parts, 202 and 1239, that multiplied together give a triangular number (250278 = T₇₀₇).

The spelling of 2021239 in words is "two million, twenty-one thousand, two hundred thirty-nine".