42006221756 has 6 divisors (see below), whose sum is σ = 73510888080. Its totient is φ = 21003110876.

The previous prime is 42006221669. The next prime is 42006221779. The reversal of 42006221756 is 65712260024.

42006221756 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5250777716 + ... + 5250777723.

It is an arithmetic number, because the mean of its divisors is an integer number (12251814680).

Almost surely, 2^42006221756 is an apocalyptic number.

It is an amenable number.

42006221756 is a deficient number, since it is larger than the sum of its proper divisors (31504666324).

42006221756 is a wasteful number, since it uses less digits than its factorization.

42006221756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10501555443 (or 10501555441 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The spelling of 42006221756 in words is "forty-two billion, six million, two hundred twenty-one thousand, seven hundred fifty-six".