42187123212 has 72 divisors (see below), whose sum is σ = 107690513616. Its totient is φ = 12846772224.

The previous prime is 42187123207. The next prime is 42187123213. The reversal of 42187123212 is 21232178124.

It is not an unprimeable number, because it can be changed into a prime (42187123213) 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, 89488 + ... + 303944.

It is an arithmetic number, because the mean of its divisors is an integer number (1495701578).

Almost surely, 2^42187123212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42187123212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53845256808).

42187123212 is an abundant number, since it is smaller than the sum of its proper divisors (65503390404).

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

42187123212 is a wasteful number, since it uses less digits than its factorization.

42187123212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214587 (or 214572 counting only the distinct ones).

The product of its digits is 10752, while the sum is 33.

The spelling of 42187123212 in words is "forty-two billion, one hundred eighty-seven million, one hundred twenty-three thousand, two hundred twelve".