2161335620 has 12 divisors (see below), whose sum is σ = 4538804844. Its totient is φ = 864534240.

The previous prime is 2161335619. The next prime is 2161335643. The reversal of 2161335620 is 265331612.

It can be written as a sum of positive squares in 2 ways, for example, as 226743364 + 1934592256 = 15058^2 + 43984^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 54033371 + ... + 54033410.

It is an arithmetic number, because the mean of its divisors is an integer number (378233737).

Almost surely, 2^2161335620 is an apocalyptic number.

2161335620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2161335620 is an abundant number, since it is smaller than the sum of its proper divisors (2377469224).

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

2161335620 is a wasteful number, since it uses less digits than its factorization.

2161335620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108066790 (or 108066788 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 2161335620 is about 46490.1669173170. The cubic root of 2161335620 is about 1292.9271948682.

The spelling of 2161335620 in words is "two billion, one hundred sixty-one million, three hundred thirty-five thousand, six hundred twenty".