43420123212 has 144 divisors (see below), whose sum is σ = 110310493440. Its totient is φ = 13275529344.

The previous prime is 43420123177. The next prime is 43420123213. The reversal of 43420123212 is 21232102434.

It is a happy number.

It is a super-2 number, since 2×43420123212² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (43420123213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 30006273 + ... + 30007719.

Almost surely, 2^43420123212 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 43420123212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55155246720).

43420123212 is an abundant number, since it is smaller than the sum of its proper divisors (66890370228).

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

43420123212 is a wasteful number, since it uses less digits than its factorization.

43420123212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1692 (or 1667 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 43420123212 its reverse (21232102434), we get a palindrome (64652225646).

The spelling of 43420123212 in words is "forty-three billion, four hundred twenty million, one hundred twenty-three thousand, two hundred twelve".