2161821342 has 8 divisors (see below), whose sum is σ = 4323642696. Its totient is φ = 720607112.

The previous prime is 2161821323. The next prime is 2161821377. The reversal of 2161821342 is 2431281612.

It is a sphenic number, since it is the product of 3 distinct primes.

2161821342 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180151773 + ... + 180151784.

It is an arithmetic number, because the mean of its divisors is an integer number (540455337).

Almost surely, 2^2161821342 is an apocalyptic number.

2161821342 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2161821342 is a wasteful number, since it uses less digits than its factorization.

2161821342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360303562.

The product of its digits is 4608, while the sum is 30.

The square root of 2161821342 is about 46495.3905457304. The cubic root of 2161821342 is about 1293.0240417960.

The spelling of 2161821342 in words is "two billion, one hundred sixty-one million, eight hundred twenty-one thousand, three hundred forty-two".