2021161563 has 6 divisors (see below), whose sum is σ = 2919455604. Its totient is φ = 1347441036.

The previous prime is 2021161559. The next prime is 2021161579. The reversal of 2021161563 is 3651611202.

2021161563 is a `hidden beast` number, since 20 + 21 + 1 + 61 + 563 = 666.

It is not a de Polignac number, because 2021161563 - 2² = 2021161559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2021161553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 112286745 + ... + 112286762.

It is an arithmetic number, because the mean of its divisors is an integer number (486575934).

Almost surely, 2^2021161563 is an apocalyptic number.

2021161563 is a deficient number, since it is larger than the sum of its proper divisors (898294041).

2021161563 is a wasteful number, since it uses less digits than its factorization.

2021161563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224573513 (or 224573510 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 2021161563 is about 44957.3304701247. The cubic root of 2021161563 is about 1264.3491187255.

Adding to 2021161563 its reverse (3651611202), we get a palindrome (5672772765).

The spelling of 2021161563 in words is "two billion, twenty-one million, one hundred sixty-one thousand, five hundred sixty-three".