2021331540 has 48 divisors (see below), whose sum is σ = 5905807488. Its totient is φ = 515585664.

The previous prime is 2021331503. The next prime is 2021331547. The reversal of 2021331540 is 451331202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021331547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 730987 + ... + 733746.

It is an arithmetic number, because the mean of its divisors is an integer number (123037656).

Almost surely, 2^2021331540 is an apocalyptic number.

2021331540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021331540 is an abundant number, since it is smaller than the sum of its proper divisors (3884475948).

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

2021331540 is a wasteful number, since it uses less digits than its factorization.

2021331540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1464768 (or 1464766 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 2021331540 is about 44959.2208562382. The cubic root of 2021331540 is about 1264.3845610919.

Adding to 2021331540 its reverse (451331202), we get a palindrome (2472662742).

The spelling of 2021331540 in words is "two billion, twenty-one million, three hundred thirty-one thousand, five hundred forty".