20011133221 has 4 divisors (see below), whose sum is σ = 20115903744. Its totient is φ = 19906362700.

The previous prime is 20011133201. The next prime is 20011133231. The reversal of 20011133221 is 12233111002.

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 20011133221 - 2⁵ = 20011133189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011133195 and 20011133204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011133201) 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, 52384975 + ... + 52385356.

It is an arithmetic number, because the mean of its divisors is an integer number (5028975936).

Almost surely, 2^20011133221 is an apocalyptic number.

It is an amenable number.

20011133221 is a deficient number, since it is larger than the sum of its proper divisors (104770523).

20011133221 is a wasteful number, since it uses less digits than its factorization.

20011133221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104770522.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 20011133221 its reverse (12233111002), we get a palindrome (32244244223).

It can be divided in two parts, 200111 and 33221, that added together give a palindrome (233332).

The spelling of 20011133221 in words is "twenty billion, eleven million, one hundred thirty-three thousand, two hundred twenty-one".