842231261521 has 16 divisors (see below), whose sum is σ = 923156136448. Its totient is φ = 763646875200.

The previous prime is 842231261519. The next prime is 842231261533. The reversal of 842231261521 is 125162132248.

It is a cyclic number.

It is not a de Polignac number, because 842231261521 - 2¹ = 842231261519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (842231261621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153945 + ... + 1306966.

It is an arithmetic number, because the mean of its divisors is an integer number (57697258528).

Almost surely, 2^842231261521 is an apocalyptic number.

It is an amenable number.

842231261521 is a deficient number, since it is larger than the sum of its proper divisors (80924874927).

842231261521 is a wasteful number, since it uses less digits than its factorization.

842231261521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1461712.

The product of its digits is 46080, while the sum is 37.

Adding to 842231261521 its reverse (125162132248), we get a palindrome (967393393769).

The spelling of 842231261521 in words is "eight hundred forty-two billion, two hundred thirty-one million, two hundred sixty-one thousand, five hundred twenty-one".