20163253221 has 6 divisors (see below), whose sum is σ = 29124699110. Its totient is φ = 13442168808.

The previous prime is 20163253211. The next prime is 20163253249. The reversal of 20163253221 is 12235236102.

It is a happy number.

20163253221 is a `hidden beast` number, since 2 + 0 + 1 + 632 + 5 + 3 + 2 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19199150721 + 964102500 = 138561^2 + 31050^2 .

It is not a de Polignac number, because 20163253221 - 2²² = 20159058917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20163253211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1120180726 + ... + 1120180743.

Almost surely, 2^20163253221 is an apocalyptic number.

It is an amenable number.

20163253221 is a deficient number, since it is larger than the sum of its proper divisors (8961445889).

20163253221 is a wasteful number, since it uses less digits than its factorization.

20163253221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2240361475 (or 2240361472 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 20163253221 its reverse (12235236102), we get a palindrome (32398489323).

The spelling of 20163253221 in words is "twenty billion, one hundred sixty-three million, two hundred fifty-three thousand, two hundred twenty-one".