42000421 has 8 divisors (see below), whose sum is σ = 44731224. Its totient is φ = 39298560.

The previous prime is 42000419. The next prime is 42000457. The reversal of 42000421 is 12400024.

It can be written as a sum of positive squares in 4 ways, for example, as 6180196 + 35820225 = 2486^2 + 5985^2 .

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

It is not a de Polignac number, because 42000421 - 2¹ = 42000419 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 (42000521) 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, 4200 + ... + 10081.

It is an arithmetic number, because the mean of its divisors is an integer number (5591403).

Almost surely, 2^42000421 is an apocalyptic number.

It is an amenable number.

42000421 is a deficient number, since it is larger than the sum of its proper divisors (2730803).

42000421 is a wasteful number, since it uses less digits than its factorization.

42000421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14471.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 42000421 is about 6480.7731791816. The cubic root of 42000421 is about 347.6038259191.

Adding to 42000421 its reverse (12400024), we get a palindrome (54400445).

The spelling of 42000421 in words is "forty-two million, four hundred twenty-one", and thus it is an aban number.