42021423 has 20 divisors (see below), whose sum is σ = 63342048. Its totient is φ = 27760320.

The previous prime is 42021401. The next prime is 42021509. The reversal of 42021423 is 32412024.

It is not a de Polignac number, because 42021423 - 2⁶ = 42021359 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42021396 and 42021405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42021223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6858 + ... + 11448.

Almost surely, 2^42021423 is an apocalyptic number.

42021423 is a deficient number, since it is larger than the sum of its proper divisors (21320625).

42021423 is a wasteful number, since it uses less digits than its factorization.

42021423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4716 (or 4707 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 42021423 is about 6482.3933080306. The cubic root of 42021423 is about 347.6617551722.

Adding to 42021423 its reverse (32412024), we get a palindrome (74433447).

It can be divided in two parts, 4202 and 1423, that added together give a square (5625 = 75²).

The spelling of 42021423 in words is "forty-two million, twenty-one thousand, four hundred twenty-three".