42521660424 has 64 divisors (see below), whose sum is σ = 118715414400. Its totient is φ = 14101924032.

The previous prime is 42521660399. The next prime is 42521660449. The reversal of 42521660424 is 42406612524.

42521660424 is a `hidden beast` number, since 4 + 2 + 5 + 21 + 6 + 604 + 24 = 666.

It is an interprime number because it is at equal distance from previous prime (42521660399) and next prime (42521660449).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 457092 + ... + 542195.

It is an arithmetic number, because the mean of its divisors is an integer number (1854928350).

Almost surely, 2^42521660424 is an apocalyptic number.

It is an amenable number.

42521660424 is an abundant number, since it is smaller than the sum of its proper divisors (76193753976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42521660424 is a wasteful number, since it uses less digits than its factorization.

42521660424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999499 (or 999489 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 36.

The spelling of 42521660424 in words is "forty-two billion, five hundred twenty-one million, six hundred sixty thousand, four hundred twenty-four".