1021231161 has 12 divisors (see below), whose sum is σ = 1475476288. Its totient is φ = 680652504.

The previous prime is 1021231151. The next prime is 1021231163. The reversal of 1021231161 is 1611321201.

It is not a de Polignac number, because 1021231161 - 2⁶ = 1021231097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021231163) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32556 + ... + 55698.

Almost surely, 2^1021231161 is an apocalyptic number.

It is an amenable number.

1021231161 is a deficient number, since it is larger than the sum of its proper divisors (454245127).

1021231161 is a wasteful number, since it uses less digits than its factorization.

1021231161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28052 (or 28049 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 1021231161 is about 31956.7076057594. The cubic root of 1021231161 is about 1007.0275514979.

Adding to 1021231161 its reverse (1611321201), we get a palindrome (2632552362).

The spelling of 1021231161 in words is "one billion, twenty-one million, two hundred thirty-one thousand, one hundred sixty-one".