42221521431524 has 24 divisors (see below), whose sum is σ = 75962297677560. Its totient is φ = 20519175799296.

The previous prime is 42221521431511. The next prime is 42221521431533. The reversal of 42221521431524 is 42513412512224.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 36702780791524 + 5518740640000 = 6058282^2 + 2349200^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145853639 + ... + 146142830.

It is an arithmetic number, because the mean of its divisors is an integer number (3165095736565).

Almost surely, 2^{42221521431524} is an apocalyptic number.

It is an amenable number.

42221521431524 is a deficient number, since it is larger than the sum of its proper divisors (33740776246036).

42221521431524 is a wasteful number, since it uses less digits than its factorization.

42221521431524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291997487 (or 291997485 counting only the distinct ones).

The product of its digits is 153600, while the sum is 38.

Adding to 42221521431524 its reverse (42513412512224), we get a palindrome (84734933943748).

The spelling of 42221521431524 in words is "forty-two trillion, two hundred twenty-one billion, five hundred twenty-one million, four hundred thirty-one thousand, five hundred twenty-four".