2171506140 has 72 divisors (see below), whose sum is σ = 6595701840. Its totient is φ = 578294784.

The previous prime is 2171506097. The next prime is 2171506163. The reversal of 2171506140 is 416051712.

It is a happy number.

2171506140 is a `hidden beast` number, since 2 + 17 + 1 + 506 + 140 = 666.

2171506140 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 133996 + ... + 149324.

It is an arithmetic number, because the mean of its divisors is an integer number (91606970).

Almost surely, 2^2171506140 is an apocalyptic number.

2171506140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2171506140 is an abundant number, since it is smaller than the sum of its proper divisors (4424195700).

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

2171506140 is a wasteful number, since it uses less digits than its factorization.

2171506140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16131 (or 16126 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 2171506140 is about 46599.4220994209. The cubic root of 2171506140 is about 1294.9520492275.

Adding to 2171506140 its reverse (416051712), we get a palindrome (2587557852).

The spelling of 2171506140 in words is "two billion, one hundred seventy-one million, five hundred six thousand, one hundred forty".