42241521 has 32 divisors (see below), whose sum is σ = 66963456. Its totient is φ = 23184000.

The previous prime is 42241519. The next prime is 42241571. The reversal of 42241521 is 12514224.

It is not a de Polignac number, because 42241521 - 2¹ = 42241519 is a prime.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42241571) 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, 60786 + ... + 61476.

It is an arithmetic number, because the mean of its divisors is an integer number (2092608).

Almost surely, 2^42241521 is an apocalyptic number.

42241521 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

42241521 is a deficient number, since it is larger than the sum of its proper divisors (24721935).

42241521 is a wasteful number, since it uses less digits than its factorization.

42241521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813.

The product of its digits is 640, while the sum is 21.

The square root of 42241521 is about 6499.3477365040. The cubic root of 42241521 is about 348.2676877482.

Adding to 42241521 its reverse (12514224), we get a palindrome (54755745).

The spelling of 42241521 in words is "forty-two million, two hundred forty-one thousand, five hundred twenty-one".