42012043421 has 4 divisors (see below), whose sum is σ = 43147504092. Its totient is φ = 40876582752.

The previous prime is 42012043399. The next prime is 42012043433. The reversal of 42012043421 is 12434021024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40236348100 + 1775695321 = 200590^2 + 42139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42012043421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42012043121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 567730280 + ... + 567730353.

It is an arithmetic number, because the mean of its divisors is an integer number (10786876023).

Almost surely, 2^42012043421 is an apocalyptic number.

It is an amenable number.

42012043421 is a deficient number, since it is larger than the sum of its proper divisors (1135460671).

42012043421 is a wasteful number, since it uses less digits than its factorization.

42012043421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1135460670.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 42012043421 its reverse (12434021024), we get a palindrome (54446064445).

The spelling of 42012043421 in words is "forty-two billion, twelve million, forty-three thousand, four hundred twenty-one".