2021161081 has 4 divisors (see below), whose sum is σ = 2127538000. Its totient is φ = 1914784164.

The previous prime is 2021161067. The next prime is 2021161111. The reversal of 2021161081 is 1801611202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2021161081 - 2¹¹ = 2021159033 is a prime.

It is a super-2 number, since 2×2021161081² = 8170184230698177122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021161031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53188431 + ... + 53188468.

It is an arithmetic number, because the mean of its divisors is an integer number (531884500).

Almost surely, 2^2021161081 is an apocalyptic number.

It is an amenable number.

2021161081 is a deficient number, since it is larger than the sum of its proper divisors (106376919).

2021161081 is a wasteful number, since it uses less digits than its factorization.

2021161081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106376918.

The product of its (nonzero) digits is 192, while the sum is 22.

The square root of 2021161081 is about 44957.3251094858. The cubic root of 2021161081 is about 1264.3490182195.

Adding to 2021161081 its reverse (1801611202), we get a palindrome (3822772283).

The spelling of 2021161081 in words is "two billion, twenty-one million, one hundred sixty-one thousand, eighty-one".