2161340742 has 32 divisors (see below), whose sum is σ = 4804634880. Its totient is φ = 642593120.

The previous prime is 2161340723. The next prime is 2161340743. The reversal of 2161340742 is 2470431612.

It is a super-2 number, since 2×2161340742² = 9342787606058221128, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161340743) by changing a digit.

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, 305442 + ... + 312437.

It is an arithmetic number, because the mean of its divisors is an integer number (150144840).

Almost surely, 2^2161340742 is an apocalyptic number.

2161340742 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

2161340742 is an abundant number, since it is smaller than the sum of its proper divisors (2643294138).

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

2161340742 is a wasteful number, since it uses less digits than its factorization.

2161340742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617948.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 2161340742 is about 46490.2220042021. Note that the first 3 decimals coincide. The cubic root of 2161340742 is about 1292.9282162070.

The spelling of 2161340742 in words is "two billion, one hundred sixty-one million, three hundred forty thousand, seven hundred forty-two".