42521488621 has 4 divisors (see below), whose sum is σ = 42524268192. Its totient is φ = 42518709052.

The previous prime is 42521488619. The next prime is 42521488649. The reversal of 42521488621 is 12688412524.

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 42521488621 - 2¹ = 42521488619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42521488601) 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, 1366711 + ... + 1397476.

It is an arithmetic number, because the mean of its divisors is an integer number (10631067048).

Almost surely, 2^42521488621 is an apocalyptic number.

It is an amenable number.

42521488621 is a deficient number, since it is larger than the sum of its proper divisors (2779571).

42521488621 is a wasteful number, since it uses less digits than its factorization.

42521488621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2779570.

The product of its digits is 245760, while the sum is 43.

The spelling of 42521488621 in words is "forty-two billion, five hundred twenty-one million, four hundred eighty-eight thousand, six hundred twenty-one".