40042021212 has 144 divisors (see below), whose sum is σ = 107255715840. Its totient is φ = 12570015744.

The previous prime is 40042021211. The next prime is 40042021249. The reversal of 40042021212 is 21212024004.

40042021212 is a `hidden beast` number, since 400 + 42 + 0 + 212 + 12 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40042021211) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32901628 + ... + 32902844.

It is an arithmetic number, because the mean of its divisors is an integer number (744831360).

Almost surely, 2^40042021212 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 40042021212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53627857920).

40042021212 is an abundant number, since it is smaller than the sum of its proper divisors (67213694628).

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

40042021212 is a wasteful number, since it uses less digits than its factorization.

40042021212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1832 (or 1827 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 40042021212 its reverse (21212024004), we get a palindrome (61254045216).

The spelling of 40042021212 in words is "forty billion, forty-two million, twenty-one thousand, two hundred twelve".