2171251020 has 48 divisors (see below), whose sum is σ = 6243820128. Its totient is φ = 563351040.

The previous prime is 2171251013. The next prime is 2171251039. The reversal of 2171251020 is 201521712.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 486801 + ... + 491240.

It is an arithmetic number, because the mean of its divisors is an integer number (130079586).

Almost surely, 2^2171251020 is an apocalyptic number.

2171251020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2171251020 is an abundant number, since it is smaller than the sum of its proper divisors (4072569108).

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

2171251020 is a wasteful number, since it uses less digits than its factorization.

2171251020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978090 (or 978088 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 2171251020 is about 46596.6846460132. The cubic root of 2171251020 is about 1294.9013346414.

Adding to 2171251020 its reverse (201521712), we get a palindrome (2372772732).

The spelling of 2171251020 in words is "two billion, one hundred seventy-one million, two hundred fifty-one thousand, twenty".