2180751021 has 6 divisors (see below), whose sum is σ = 3149973710. Its totient is φ = 1453834008.

The previous prime is 2180750987. The next prime is 2180751059. The reversal of 2180751021 is 1201570812.

It can be written as a sum of positive squares in only one way, i.e., 2062158921 + 118592100 = 45411^2 + 10890^2 .

It is not a de Polignac number, because 2180751021 - 2¹³ = 2180742829 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2180751071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 121152826 + ... + 121152843.

Almost surely, 2^2180751021 is an apocalyptic number.

It is an amenable number.

2180751021 is a deficient number, since it is larger than the sum of its proper divisors (969222689).

2180751021 is a wasteful number, since it uses less digits than its factorization.

2180751021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242305675 (or 242305672 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 2180751021 is about 46698.5119784346. The cubic root of 2180751021 is about 1296.7871393526.

The spelling of 2180751021 in words is "two billion, one hundred eighty million, seven hundred fifty-one thousand, twenty-one".