42921800856 has 80 divisors (see below), whose sum is σ = 131149968840. Its totient is φ = 13006604160.

The previous prime is 42921800837. The next prime is 42921800861. The reversal of 42921800856 is 65800812924.

42921800856 is a `hidden beast` number, since 429 + 218 + 0 + 0 + 8 + 5 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3003661 + ... + 3017916.

Almost surely, 2^42921800856 is an apocalyptic number.

It is an amenable number.

42921800856 is an abundant number, since it is smaller than the sum of its proper divisors (88228167984).

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

42921800856 is a wasteful number, since it uses less digits than its factorization.

42921800856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6021606 (or 6021593 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 42921800856 in words is "forty-two billion, nine hundred twenty-one million, eight hundred thousand, eight hundred fifty-six".