42355521 has 16 divisors (see below), whose sum is σ = 67576320. Its totient is φ = 26064720.

The previous prime is 42355513. The next prime is 42355543. The reversal of 42355521 is 12555324.

It is a happy number.

It is not a de Polignac number, because 42355521 - 2³ = 42355513 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (42355561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59985 + ... + 60686.

It is an arithmetic number, because the mean of its divisors is an integer number (4223520).

Almost surely, 2^42355521 is an apocalyptic number.

It is an amenable number.

42355521 is a deficient number, since it is larger than the sum of its proper divisors (25220799).

42355521 is a wasteful number, since it uses less digits than its factorization.

42355521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120693 (or 120687 counting only the distinct ones).

The product of its digits is 6000, while the sum is 27.

The square root of 42355521 is about 6508.1119381891. Note that the first 3 decimals coincide. The cubic root of 42355521 is about 348.5807040489.

The spelling of 42355521 in words is "forty-two million, three hundred fifty-five thousand, five hundred twenty-one".