42021866072 has 16 divisors (see below), whose sum is σ = 78828892200. Its totient is φ = 21000828160.

The previous prime is 42021866071. The next prime is 42021866101. The reversal of 42021866072 is 27066812024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42021866071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1245422 + ... + 1278717.

Almost surely, 2^42021866072 is an apocalyptic number.

It is an amenable number.

42021866072 is a deficient number, since it is larger than the sum of its proper divisors (36807026128).

42021866072 is a wasteful number, since it uses less digits than its factorization.

42021866072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2526226 (or 2526222 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 38.

The spelling of 42021866072 in words is "forty-two billion, twenty-one million, eight hundred sixty-six thousand, seventy-two".