42001421 has 8 divisors (see below), whose sum is σ = 52365504. Its totient is φ = 32728320.

The previous prime is 42001397. The next prime is 42001447. The reversal of 42001421 is 12410024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42001421 - 2⁶ = 42001357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42001396 and 42001405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42001471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272660 + ... + 272813.

It is an arithmetic number, because the mean of its divisors is an integer number (6545688).

Almost surely, 2^42001421 is an apocalyptic number.

It is an amenable number.

42001421 is a deficient number, since it is larger than the sum of its proper divisors (10364083).

42001421 is a wasteful number, since it uses less digits than its factorization.

42001421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545491.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 42001421 is about 6480.8503300107. The cubic root of 42001421 is about 347.6065846300.

Adding to 42001421 its reverse (12410024), we get a palindrome (54411445).

The spelling of 42001421 in words is "forty-two million, one thousand, four hundred twenty-one".