2171052020 has 12 divisors (see below), whose sum is σ = 4559209284. Its totient is φ = 868420800.

The previous prime is 2171052019. The next prime is 2171052029. The reversal of 2171052020 is 202501712.

It can be written as a sum of positive squares in 2 ways, for example, as 1577837284 + 593214736 = 39722^2 + 24356^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 108552601 = 2171052020 / (2 + 1 + 7 + 1 + 0 + 5 + 2 + 0 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 2171051983 and 2171052001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2171052029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54276281 + ... + 54276320.

It is an arithmetic number, because the mean of its divisors is an integer number (379934107).

Almost surely, 2^2171052020 is an apocalyptic number.

2171052020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2171052020 is an abundant number, since it is smaller than the sum of its proper divisors (2388157264).

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

2171052020 is a wasteful number, since it uses less digits than its factorization.

2171052020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108552610 (or 108552608 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 2171052020 is about 46594.5492520316. The cubic root of 2171052020 is about 1294.8617732340.

Adding to 2171052020 its reverse (202501712), we get a palindrome (2373553732).

The spelling of 2171052020 in words is "two billion, one hundred seventy-one million, fifty-two thousand, twenty".