42071421 has 16 divisors (see below), whose sum is σ = 64262144. Its totient is φ = 23983344.

The previous prime is 42071399. The next prime is 42071461. The reversal of 42071421 is 12417024.

It is a happy number.

It is not a de Polignac number, because 42071421 - 2⁵ = 42071389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42071461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7560 + ... + 11886.

It is an arithmetic number, because the mean of its divisors is an integer number (4016384).

Almost surely, 2^42071421 is an apocalyptic number.

It is an amenable number.

42071421 is a deficient number, since it is larger than the sum of its proper divisors (22190723).

42071421 is a wasteful number, since it uses less digits than its factorization.

42071421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4800.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 42071421 is about 6486.2486076314. The cubic root of 42071421 is about 347.7995856863.

Adding to 42071421 its reverse (12417024), we get a palindrome (54488445).

The spelling of 42071421 in words is "forty-two million, seventy-one thousand, four hundred twenty-one".