42121043440 has 40 divisors (see below), whose sum is σ = 111921631200. Its totient is φ = 14441500416.

The previous prime is 42121043413. The next prime is 42121043467. The reversal of 42121043440 is 4434012124.

It is an interprime number because it is at equal distance from previous prime (42121043413) and next prime (42121043467).

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37607515 + ... + 37608634.

It is an arithmetic number, because the mean of its divisors is an integer number (2798040780).

Almost surely, 2^42121043440 is an apocalyptic number.

42121043440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42121043440 is an abundant number, since it is smaller than the sum of its proper divisors (69800587760).

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

42121043440 is a wasteful number, since it uses less digits than its factorization.

42121043440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75216169 (or 75216163 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 42121043440 its reverse (4434012124), we get a palindrome (46555055564).

The spelling of 42121043440 in words is "forty-two billion, one hundred twenty-one million, forty-three thousand, four hundred forty".