3921215900800 has 96 divisors (see below), whose sum is σ = 10567231354800. Its totient is φ = 1425896678400.

The previous prime is 3921215900759. The next prime is 3921215900801. The reversal of 3921215900800 is 80095121293.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (3921215900801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55663890 + ... + 55734289.

Almost surely, 2^{3921215900800} is an apocalyptic number.

It is an amenable number.

3921215900800 is an abundant number, since it is smaller than the sum of its proper divisors (6646015454000).

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

3921215900800 is a wasteful number, since it uses less digits than its factorization.

3921215900800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111398214 (or 111398197 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 40.

The spelling of 3921215900800 in words is "three trillion, nine hundred twenty-one billion, two hundred fifteen million, nine hundred thousand, eight hundred".