42420142421 has 4 divisors (see below), whose sum is σ = 43788534144. Its totient is φ = 41051750700.

The previous prime is 42420142409. The next prime is 42420142433. The reversal of 42420142421 is 12424102424.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (42420142409) and next prime (42420142433).

It is a cyclic number.

It is not a de Polignac number, because 42420142421 - 2¹⁰ = 42420141397 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 (42420147421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 684195815 + ... + 684195876.

It is an arithmetic number, because the mean of its divisors is an integer number (10947133536).

Almost surely, 2^42420142421 is an apocalyptic number.

It is an amenable number.

42420142421 is a deficient number, since it is larger than the sum of its proper divisors (1368391723).

42420142421 is a wasteful number, since it uses less digits than its factorization.

42420142421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1368391722.

The product of its (nonzero) digits is 4096, while the sum is 26.

Adding to 42420142421 its reverse (12424102424), we get a palindrome (54844244845).

The spelling of 42420142421 in words is "forty-two billion, four hundred twenty million, one hundred forty-two thousand, four hundred twenty-one".