2181406516 has 12 divisors (see below), whose sum is σ = 3834581632. Its totient is φ = 1085811768.

The previous prime is 2181406501. The next prime is 2181406537. The reversal of 2181406516 is 6156041812.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 1221870 + ... + 1223653.

Almost surely, 2^2181406516 is an apocalyptic number.

It is an amenable number.

2181406516 is a deficient number, since it is larger than the sum of its proper divisors (1653175116).

2181406516 is a wasteful number, since it uses less digits than its factorization.

2181406516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2445750 (or 2445748 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 2181406516 is about 46705.5298224953. The cubic root of 2181406516 is about 1296.9170567256.

The spelling of 2181406516 in words is "two billion, one hundred eighty-one million, four hundred six thousand, five hundred sixteen".