42121421312 has 80 divisors (see below), whose sum is σ = 88454963520. Its totient is φ = 19999322112.

The previous prime is 42121421311. The next prime is 42121421327. The reversal of 42121421312 is 21312412124.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (42121421311) 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, 1623998 + ... + 1649730.

It is an arithmetic number, because the mean of its divisors is an integer number (1105687044).

Almost surely, 2^42121421312 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 42121421312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44227481760).

42121421312 is an abundant number, since it is smaller than the sum of its proper divisors (46333542208).

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

42121421312 is a wasteful number, since it uses less digits than its factorization.

42121421312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25913 (or 25897 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

Adding to 42121421312 its reverse (21312412124), we get a palindrome (63433833436).

The spelling of 42121421312 in words is "forty-two billion, one hundred twenty-one million, four hundred twenty-one thousand, three hundred twelve".