2161871632 has 20 divisors (see below), whose sum is σ = 4206159360. Its totient is φ = 1076411168.

The previous prime is 2161871629. The next prime is 2161871633. The reversal of 2161871632 is 2361781612.

It is a junction number, because it is equal to n+sod(n) for n = 2161871591 and 2161871600.

It is not an unprimeable number, because it can be changed into a prime (2161871633) 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, 278848 + ... + 286495.

It is an arithmetic number, because the mean of its divisors is an integer number (210307968).

Almost surely, 2^2161871632 is an apocalyptic number.

It is an amenable number.

2161871632 is a deficient number, since it is larger than the sum of its proper divisors (2044287728).

2161871632 is a wasteful number, since it uses less digits than its factorization.

2161871632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565590 (or 565584 counting only the distinct ones).

The product of its digits is 24192, while the sum is 37.

The square root of 2161871632 is about 46495.9313488826. The cubic root of 2161871632 is about 1293.0340681680.

The spelling of 2161871632 in words is "two billion, one hundred sixty-one million, eight hundred seventy-one thousand, six hundred thirty-two".