2021203540 has 24 divisors (see below), whose sum is σ = 4248334440. Its totient is φ = 807756288.

The previous prime is 2021203537. The next prime is 2021203567. The reversal of 2021203540 is 453021202.

It can be written as a sum of positive squares in 4 ways, for example, as 161604 + 2021041936 = 402^2 + 44956^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22177 + ... + 67336.

It is an arithmetic number, because the mean of its divisors is an integer number (177013935).

Almost surely, 2^2021203540 is an apocalyptic number.

2021203540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021203540 is an abundant number, since it is smaller than the sum of its proper divisors (2227130900).

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

2021203540 is a wasteful number, since it uses less digits than its factorization.

2021203540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90651 (or 90649 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 2021203540 is about 44957.7973214881. The cubic root of 2021203540 is about 1264.3578716487.

Adding to 2021203540 its reverse (453021202), we get a palindrome (2474224742).

The spelling of 2021203540 in words is "two billion, twenty-one million, two hundred three thousand, five hundred forty".