20111132221 has 4 divisors (see below), whose sum is σ = 20310252444. Its totient is φ = 19912012000.

The previous prime is 20111132213. The next prime is 20111132227. The reversal of 20111132221 is 12223111102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17705229721 + 2405902500 = 133061^2 + 49050^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111132221 - 2³ = 20111132213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20111132195 and 20111132204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111132227) 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, 99559960 + ... + 99560161.

It is an arithmetic number, because the mean of its divisors is an integer number (5077563111).

Almost surely, 2^20111132221 is an apocalyptic number.

It is an amenable number.

20111132221 is a deficient number, since it is larger than the sum of its proper divisors (199120223).

20111132221 is a wasteful number, since it uses less digits than its factorization.

20111132221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199120222.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 20111132221 its reverse (12223111102), we get a palindrome (32334243323).

It can be divided in two parts, 201111 and 32221, that added together give a palindrome (233332).

The spelling of 20111132221 in words is "twenty billion, one hundred eleven million, one hundred thirty-two thousand, two hundred twenty-one".