2021612500 has 36 divisors (see below), whose sum is σ = 4422021660. Its totient is φ = 808640000.

The previous prime is 2021612497. The next prime is 2021612501. The reversal of 2021612500 is 52161202.

It can be written as a sum of positive squares in 6 ways, for example, as 1610577424 + 411035076 = 40132^2 + 20274^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021612501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68365 + ... + 93364.

It is an arithmetic number, because the mean of its divisors is an integer number (122833935).

Almost surely, 2^2021612500 is an apocalyptic number.

2021612500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021612500 is an abundant number, since it is smaller than the sum of its proper divisors (2400409160).

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

2021612500 is an equidigital number, since it uses as much as digits as its factorization.

2021612500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161758 (or 161736 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 2021612500 is about 44962.3453569762. The cubic root of 2021612500 is about 1264.4431404691.

Adding to 2021612500 its reverse (52161202), we get a palindrome (2073773702).

The spelling of 2021612500 in words is "two billion, twenty-one million, six hundred twelve thousand, five hundred".