42420223521 has 24 divisors (see below), whose sum is σ = 66055429440. Its totient is φ = 26077687776.

The previous prime is 42420223507. The next prime is 42420223523. The reversal of 42420223521 is 12532202424.

42420223521 is a `hidden beast` number, since 4 + 2 + 420 + 2 + 235 + 2 + 1 = 666.

It is not a de Polignac number, because 42420223521 - 2¹⁵ = 42420190753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42420223523) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74331 + ... + 300608.

It is an arithmetic number, because the mean of its divisors is an integer number (2752309560).

Almost surely, 2^42420223521 is an apocalyptic number.

It is an amenable number.

42420223521 is a deficient number, since it is larger than the sum of its proper divisors (23635205919).

42420223521 is a wasteful number, since it uses less digits than its factorization.

42420223521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375925 (or 375922 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

Adding to 42420223521 its reverse (12532202424), we get a palindrome (54952425945).

The spelling of 42420223521 in words is "forty-two billion, four hundred twenty million, two hundred twenty-three thousand, five hundred twenty-one".