42535621 has 4 divisors (see below), whose sum is σ = 42577600. Its totient is φ = 42493644.

The previous prime is 42535613. The next prime is 42535631. The reversal of 42535621 is 12653524.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42535621 - 2³ = 42535613 is a prime.

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 42535621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42535631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19431 + ... + 21508.

It is an arithmetic number, because the mean of its divisors is an integer number (10644400).

Almost surely, 2^42535621 is an apocalyptic number.

It is an amenable number.

42535621 is a deficient number, since it is larger than the sum of its proper divisors (41979).

42535621 is a wasteful number, since it uses less digits than its factorization.

42535621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41978.

The product of its digits is 7200, while the sum is 28.

The square root of 42535621 is about 6521.9338389775. The cubic root of 42535621 is about 349.0740723393.

It can be divided in two parts, 425 and 35621, that added together give a triangular number (36046 = T₂₆₈).

The spelling of 42535621 in words is "forty-two million, five hundred thirty-five thousand, six hundred twenty-one".