42021273 has 32 divisors (see below), whose sum is σ = 66169600. Its totient is φ = 23708160.

The previous prime is 42021257. The next prime is 42021313. The reversal of 42021273 is 37212024.

It is not a de Polignac number, because 42021273 - 2⁴ = 42021257 is a prime.

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

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

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 99603 + ... + 100023.

It is an arithmetic number, because the mean of its divisors is an integer number (2067800).

Almost surely, 2^42021273 is an apocalyptic number.

It is an amenable number.

42021273 is a deficient number, since it is larger than the sum of its proper divisors (24148327).

42021273 is an equidigital number, since it uses as much as digits as its factorization.

42021273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542 (or 528 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 42021273 is about 6482.3817382194. The cubic root of 42021273 is about 347.6613414996.

Adding to 42021273 its reverse (37212024), we get a palindrome (79233297).

Subtracting from 42021273 its reverse (37212024), we obtain a square (4809249 = 2193²).

The spelling of 42021273 in words is "forty-two million, twenty-one thousand, two hundred seventy-three".