2121545020 has 24 divisors (see below), whose sum is σ = 5091708384. Its totient is φ = 727386816.

The previous prime is 2121545011. The next prime is 2121545057. The reversal of 2121545020 is 205451212.

It is a junction number, because it is equal to n+sod(n) for n = 2121544982 and 2121545000.

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, 7576807 + ... + 7577086.

It is an arithmetic number, because the mean of its divisors is an integer number (212154516).

Almost surely, 2^2121545020 is an apocalyptic number.

2121545020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121545020 is an abundant number, since it is smaller than the sum of its proper divisors (2970163364).

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

2121545020 is a wasteful number, since it uses less digits than its factorization.

2121545020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15153909 (or 15153907 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 2121545020 is about 46060.2325222094. The cubic root of 2121545020 is about 1284.9436545113.

Adding to 2121545020 its reverse (205451212), we get a palindrome (2326996232).

The spelling of 2121545020 in words is "two billion, one hundred twenty-one million, five hundred forty-five thousand, twenty".