42015221521 has 8 divisors (see below), whose sum is σ = 51711041984. Its totient is φ = 33242812560.

The previous prime is 42015221497. The next prime is 42015221539. The reversal of 42015221521 is 12512251024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42015221521 - 2⁷ = 42015221393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42015221561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230852775 + ... + 230852956.

It is an arithmetic number, because the mean of its divisors is an integer number (6463880248).

Almost surely, 2^42015221521 is an apocalyptic number.

It is an amenable number.

42015221521 is a deficient number, since it is larger than the sum of its proper divisors (9695820463).

42015221521 is a wasteful number, since it uses less digits than its factorization.

42015221521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461705751.

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 42015221521 its reverse (12512251024), we get a palindrome (54527472545).

The spelling of 42015221521 in words is "forty-two billion, fifteen million, two hundred twenty-one thousand, five hundred twenty-one".