2161787360420 has 12 divisors (see below), whose sum is σ = 4539753456924. Its totient is φ = 864714944160.

The previous prime is 2161787360417. The next prime is 2161787360449. The reversal of 2161787360420 is 240637871612.

It can be written as a sum of positive squares in 2 ways, for example, as 976175616256 + 1185611744164 = 988016^2 + 1088858^2 .

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, 54044683991 + ... + 54044684030.

It is an arithmetic number, because the mean of its divisors is an integer number (378312788077).

Almost surely, 2^{2161787360420} is an apocalyptic number.

2161787360420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2161787360420 is an abundant number, since it is smaller than the sum of its proper divisors (2377966096504).

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

2161787360420 is a wasteful number, since it uses less digits than its factorization.

2161787360420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108089368030 (or 108089368028 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 47.

The spelling of 2161787360420 in words is "two trillion, one hundred sixty-one billion, seven hundred eighty-seven million, three hundred sixty thousand, four hundred twenty".