20001132221 has 4 divisors (see below), whose sum is σ = 22858436832. Its totient is φ = 17143827612.

The previous prime is 20001132167. The next prime is 20001132271. The reversal of 20001132221 is 12223110002.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12223110002 = 2 ⋅6111555001.

It is a cyclic number.

It is not a de Polignac number, because 20001132221 - 2¹⁰ = 20001131197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20001132196 and 20001132205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001132271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1428652295 + ... + 1428652308.

It is an arithmetic number, because the mean of its divisors is an integer number (5714609208).

Almost surely, 2^20001132221 is an apocalyptic number.

It is an amenable number.

20001132221 is a deficient number, since it is larger than the sum of its proper divisors (2857304611).

20001132221 is an equidigital number, since it uses as much as digits as its factorization.

20001132221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2857304610.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 20001132221 its reverse (12223110002), we get a palindrome (32224242223).

It can be divided in two parts, 200011 and 32221, that added together give a palindrome (232232).

The spelling of 20001132221 in words is "twenty billion, one million, one hundred thirty-two thousand, two hundred twenty-one".