3921244292856 has 128 divisors (see below), whose sum is σ = 10738932618240. Its totient is φ = 1183301222400.

The previous prime is 3921244292827. The next prime is 3921244293023. The reversal of 3921244292856 is 6582924421293.

It is a junction number, because it is equal to n+sod(n) for n = 3921244292796 and 3921244292805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 162607456 + ... + 162631568.

It is an arithmetic number, because the mean of its divisors is an integer number (83897911080).

Almost surely, 2^{3921244292856} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3921244292856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5369466309120).

3921244292856 is an abundant number, since it is smaller than the sum of its proper divisors (6817688325384).

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

3921244292856 is a wasteful number, since it uses less digits than its factorization.

3921244292856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26677 (or 26673 counting only the distinct ones).

The product of its digits is 14929920, while the sum is 57.

The spelling of 3921244292856 in words is "three trillion, nine hundred twenty-one billion, two hundred forty-four million, two hundred ninety-two thousand, eight hundred fifty-six".