42687762021 has 8 divisors (see below), whose sum is σ = 63241128960. Its totient is φ = 28458507996.

The previous prime is 42687762017. The next prime is 42687762083. The reversal of 42687762021 is 12026778624.

It is a happy number.

42687762021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42687762021 - 2² = 42687762017 is a prime.

It is a super-3 number, since 3×42687762021³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42687760021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 790514085 + ... + 790514138.

It is an arithmetic number, because the mean of its divisors is an integer number (7905141120).

Almost surely, 2^42687762021 is an apocalyptic number.

It is an amenable number.

42687762021 is a deficient number, since it is larger than the sum of its proper divisors (20553366939).

42687762021 is a wasteful number, since it uses less digits than its factorization.

42687762021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1581028232 (or 1581028226 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 45.

The spelling of 42687762021 in words is "forty-two billion, six hundred eighty-seven million, seven hundred sixty-two thousand, twenty-one".