2161385340 has 48 divisors (see below), whose sum is σ = 6215449632. Its totient is φ = 560791296.

The previous prime is 2161385339. The next prime is 2161385357. The reversal of 2161385340 is 435831612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 484579 + ... + 489018.

It is an arithmetic number, because the mean of its divisors is an integer number (129488534).

Almost surely, 2^2161385340 is an apocalyptic number.

2161385340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2161385340 is an abundant number, since it is smaller than the sum of its proper divisors (4054064292).

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

2161385340 is a wasteful number, since it uses less digits than its factorization.

2161385340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973646 (or 973644 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 2161385340 is about 46490.7016509753. The cubic root of 2161385340 is about 1292.9371090846.

It can be divided in two parts, 21613 and 85340, that added together give a triangular number (106953 = T₄₆₂).

The spelling of 2161385340 in words is "two billion, one hundred sixty-one million, three hundred eighty-five thousand, three hundred forty".