42105037421 has 4 divisors (see below), whose sum is σ = 42293849472. Its totient is φ = 41916225372.

The previous prime is 42105037417. The next prime is 42105037439. The reversal of 42105037421 is 12473050124.

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 a cyclic number.

It is not a de Polignac number, because 42105037421 - 2² = 42105037417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42105037451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94405691 + ... + 94406136.

It is an arithmetic number, because the mean of its divisors is an integer number (10573462368).

Almost surely, 2^42105037421 is an apocalyptic number.

It is an amenable number.

42105037421 is a deficient number, since it is larger than the sum of its proper divisors (188812051).

42105037421 is a wasteful number, since it uses less digits than its factorization.

42105037421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188812050.

The product of its (nonzero) digits is 6720, while the sum is 29.

Adding to 42105037421 its reverse (12473050124), we get a palindrome (54578087545).

The spelling of 42105037421 in words is "forty-two billion, one hundred five million, thirty-seven thousand, four hundred twenty-one".