42521269 has 6 divisors (see below), whose sum is σ = 49463574. Its totient is φ = 36446760.

The previous prime is 42521249. The next prime is 42521291. The reversal of 42521269 is 96212524.

It can be written as a sum of positive squares in only one way, i.e., 34082244 + 8439025 = 5838^2 + 2905^2 .

It is not a de Polignac number, because 42521269 - 2¹¹ = 42519221 is a prime.

It is a super-2 number, since 2×42521269² = 3616116634740722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42521269.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42521249) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 433842 + ... + 433939.

It is an arithmetic number, because the mean of its divisors is an integer number (8243929).

Almost surely, 2^42521269 is an apocalyptic number.

42521269 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

It is an amenable number.

42521269 is a deficient number, since it is larger than the sum of its proper divisors (6942305).

42521269 is an equidigital number, since it uses as much as digits as its factorization.

42521269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867795 (or 867788 counting only the distinct ones).

The product of its digits is 8640, while the sum is 31.

The square root of 42521269 is about 6520.8334589989. The cubic root of 42521269 is about 349.0348074084.

The spelling of 42521269 in words is "forty-two million, five hundred twenty-one thousand, two hundred sixty-nine".