2161136730 has 64 divisors (see below), whose sum is σ = 5545283328. Its totient is φ = 537123840.

The previous prime is 2161136687. The next prime is 2161136743. The reversal of 2161136730 is 376311612.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31960 + ... + 73100.

It is an arithmetic number, because the mean of its divisors is an integer number (86645052).

Almost surely, 2^2161136730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2161136730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2772641664).

2161136730 is an abundant number, since it is smaller than the sum of its proper divisors (3384146598).

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

2161136730 is a wasteful number, since it uses less digits than its factorization.

2161136730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41271.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 2161136730 is about 46488.0278136210. The cubic root of 2161136730 is about 1292.8875344878.

The spelling of 2161136730 in words is "two billion, one hundred sixty-one million, one hundred thirty-six thousand, seven hundred thirty".