42087921291 has 24 divisors (see below), whose sum is σ = 66366963936. Its totient is φ = 25545456000.

The previous prime is 42087921257. The next prime is 42087921331. The reversal of 42087921291 is 19212978024.

42087921291 is a `hidden beast` number, since 420 + 8 + 7 + 9 + 212 + 9 + 1 = 666.

42087921291 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 42087921291 - 2¹¹ = 42087919243 is a prime.

It is a super-2 number, since 2×42087921291² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42087921391) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2455335 + ... + 2472416.

It is an arithmetic number, because the mean of its divisors is an integer number (2765290164).

Almost surely, 2^42087921291 is an apocalyptic number.

42087921291 is a deficient number, since it is larger than the sum of its proper divisors (24279042645).

42087921291 is a wasteful number, since it uses less digits than its factorization.

42087921291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4927843 (or 4927840 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The spelling of 42087921291 in words is "forty-two billion, eighty-seven million, nine hundred twenty-one thousand, two hundred ninety-one".