2180408021902 has 32 divisors (see below), whose sum is σ = 3899684404224. Its totient is φ = 902704713600.

The previous prime is 2180408021887. The next prime is 2180408021999. The reversal of 2180408021902 is 2091208040812.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94020148 + ... + 94043335.

It is an arithmetic number, because the mean of its divisors is an integer number (121865137632).

Almost surely, 2^{2180408021902} is an apocalyptic number.

2180408021902 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

2180408021902 is a deficient number, since it is larger than the sum of its proper divisors (1719276382322).

2180408021902 is a wasteful number, since it uses less digits than its factorization.

2180408021902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188063544.

The product of its (nonzero) digits is 18432, while the sum is 37.

The spelling of 2180408021902 in words is "two trillion, one hundred eighty billion, four hundred eight million, twenty-one thousand, nine hundred two".