2021436 has 60 divisors (see below), whose sum is σ = 5610528. Its totient is φ = 632448.

The previous prime is 2021431. The next prime is 2021471. The reversal of 2021436 is 6341202.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021431) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5325 + ... + 5691.

2^2021436 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2021436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2805264).

2021436 is an abundant number, since it is smaller than the sum of its proper divisors (3589092).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2021436 is a wasteful number, since it uses less digits than its factorization.

2021436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400 (or 389 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 2021436 is about 1421.7721336417. The cubic root of 2021436 is about 126.4406341345.

Adding to 2021436 its reverse (6341202), we get a palindrome (8362638).

The spelling of 2021436 in words is "two million, twenty-one thousand, four hundred thirty-six".