2021253140 has 12 divisors (see below), whose sum is σ = 4244631636. Its totient is φ = 808501248.

The previous prime is 2021253077. The next prime is 2021253161. The reversal of 2021253140 is 413521202.

It can be written as a sum of positive squares in 2 ways, for example, as 507420676 + 1513832464 = 22526^2 + 38908^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 101062657 = 2021253140 / (2 + 0 + 2 + 1 + 2 + 5 + 3 + 1 + 4 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50531309 + ... + 50531348.

It is an arithmetic number, because the mean of its divisors is an integer number (353719303).

Almost surely, 2^2021253140 is an apocalyptic number.

2021253140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021253140 is an abundant number, since it is smaller than the sum of its proper divisors (2223378496).

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

2021253140 is a wasteful number, since it uses less digits than its factorization.

2021253140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101062666 (or 101062664 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 2021253140 is about 44958.3489465527. The cubic root of 2021253140 is about 1264.3682139416.

Adding to 2021253140 its reverse (413521202), we get a palindrome (2434774342).

The spelling of 2021253140 in words is "two billion, twenty-one million, two hundred fifty-three thousand, one hundred forty".