20111332211 has 4 divisors (see below), whose sum is σ = 21169823400. Its totient is φ = 19052841024.

The previous prime is 20111332207. The next prime is 20111332223. The reversal of 20111332211 is 11223311102.

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

It is a cyclic number.

It is not a de Polignac number, because 20111332211 - 2² = 20111332207 is a prime.

It is a super-2 number, since 2×20111332211² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20111332211.

It is not an unprimeable number, because it can be changed into a prime (20111332261) 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, 529245566 + ... + 529245603.

It is an arithmetic number, because the mean of its divisors is an integer number (5292455850).

Almost surely, 2^20111332211 is an apocalyptic number.

20111332211 is a deficient number, since it is larger than the sum of its proper divisors (1058491189).

20111332211 is a wasteful number, since it uses less digits than its factorization.

20111332211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058491188.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 20111332211 its reverse (11223311102), we get a palindrome (31334643313).

The spelling of 20111332211 in words is "twenty billion, one hundred eleven million, three hundred thirty-two thousand, two hundred eleven".