2166100003820 has 48 divisors (see below), whose sum is σ = 4725861809760. Its totient is φ = 832972310016.

The previous prime is 2166100003813. The next prime is 2166100003831. The reversal of 2166100003820 is 283000016612.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7879142 + ... + 8149421.

It is an arithmetic number, because the mean of its divisors is an integer number (98455454370).

Almost surely, 2^{2166100003820} is an apocalyptic number.

2166100003820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2166100003820 is an abundant number, since it is smaller than the sum of its proper divisors (2559761805940).

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

2166100003820 is a wasteful number, since it uses less digits than its factorization.

2166100003820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16028834 (or 16028832 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The spelling of 2166100003820 in words is "two trillion, one hundred sixty-six billion, one hundred million, three thousand, eight hundred twenty".