2021155040 has 24 divisors (see below), whose sum is σ = 4774979160. Its totient is φ = 808461952.

The previous prime is 2021155033. The next prime is 2021155049. The reversal of 2021155040 is 405511202.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021155049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6315950 + ... + 6316269.

It is an arithmetic number, because the mean of its divisors is an integer number (198957465).

Almost surely, 2^2021155040 is an apocalyptic number.

2021155040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021155040 is an abundant number, since it is smaller than the sum of its proper divisors (2753824120).

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

2021155040 is a wasteful number, since it uses less digits than its factorization.

2021155040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12632234 (or 12632226 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 2021155040 is about 44957.2579234988. The cubic root of 2021155040 is about 1264.3477585574.

Adding to 2021155040 its reverse (405511202), we get a palindrome (2426666242).

The spelling of 2021155040 in words is "two billion, twenty-one million, one hundred fifty-five thousand, forty".