1021531113161 has 8 divisors (see below), whose sum is σ = 1108024895040. Its totient is φ = 936167969232.

The previous prime is 1021531113157. The next prime is 1021531113167. The reversal of 1021531113161 is 1613111351201.

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 1021531113161 - 2² = 1021531113157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021531113161.

It is not an unprimeable number, because it can be changed into a prime (1021531113167) 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, 282657605 + ... + 282661218.

It is an arithmetic number, because the mean of its divisors is an integer number (138503111880).

Almost surely, 2^{1021531113161} is an apocalyptic number.

It is an amenable number.

1021531113161 is a deficient number, since it is larger than the sum of its proper divisors (86493781879).

1021531113161 is a wasteful number, since it uses less digits than its factorization.

1021531113161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565318975.

The product of its (nonzero) digits is 540, while the sum is 26.

Adding to 1021531113161 its reverse (1613111351201), we get a palindrome (2634642464362).

The spelling of 1021531113161 in words is "one trillion, twenty-one billion, five hundred thirty-one million, one hundred thirteen thousand, one hundred sixty-one".