2166921903280 has 20 divisors (see below), whose sum is σ = 5038093425312. Its totient is φ = 866768761280.

The previous prime is 2166921903271. The next prime is 2166921903281. The reversal of 2166921903280 is 823091296612.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (2166921903281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13543261816 + ... + 13543261975.

Almost surely, 2^{2166921903280} is an apocalyptic number.

2166921903280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2166921903280 is an abundant number, since it is smaller than the sum of its proper divisors (2871171522032).

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

2166921903280 is a wasteful number, since it uses less digits than its factorization.

2166921903280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27086523804 (or 27086523798 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 49.

The spelling of 2166921903280 in words is "two trillion, one hundred sixty-six billion, nine hundred twenty-one million, nine hundred three thousand, two hundred eighty".