42521919 has 8 divisors (see below), whose sum is σ = 61850112. Its totient is φ = 25770840.

The previous prime is 42521911. The next prime is 42521929. The reversal of 42521919 is 91912524.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42521919 - 2³ = 42521911 is a prime.

It is a super-2 number, since 2×42521919² = 3616227190885122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 1288543 = 42521919 / (4 + 2 + 5 + 2 + 1 + 9 + 1 + 9).

It is a self number, because there is not a number n which added to its sum of digits gives 42521919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42521911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 644239 + ... + 644304.

It is an arithmetic number, because the mean of its divisors is an integer number (7731264).

Almost surely, 2^42521919 is an apocalyptic number.

42521919 is a deficient number, since it is larger than the sum of its proper divisors (19328193).

42521919 is a wasteful number, since it uses less digits than its factorization.

42521919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1288557.

The product of its digits is 6480, while the sum is 33.

The square root of 42521919 is about 6520.8832990631. The cubic root of 42521919 is about 349.0365859024.

The spelling of 42521919 in words is "forty-two million, five hundred twenty-one thousand, nine hundred nineteen".