42021021312 has 96 divisors (see below), whose sum is σ = 120978511680. Its totient is φ = 14000214528.

The previous prime is 42021021293. The next prime is 42021021349. The reversal of 42021021312 is 21312012024.

It is a happy number.

42021021312 is a `hidden beast` number, since 420 + 21 + 0 + 213 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2737563 + ... + 2752869.

It is an arithmetic number, because the mean of its divisors is an integer number (1260192830).

Almost surely, 2^42021021312 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 42021021312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60489255840).

42021021312 is an abundant number, since it is smaller than the sum of its proper divisors (78957490368).

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

42021021312 is a wasteful number, since it uses less digits than its factorization.

42021021312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17710 (or 17695 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 42021021312 its reverse (21312012024), we get a palindrome (63333033336).

The spelling of 42021021312 in words is "forty-two billion, twenty-one million, twenty-one thousand, three hundred twelve".