20111133441 has 8 divisors (see below), whose sum is σ = 30645536704. Its totient is φ = 11492076240.

The previous prime is 20111133431. The next prime is 20111133443. The reversal of 20111133441 is 14433111102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20111133441 - 2⁶ = 20111133377 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 957673021 = 20111133441 / (2 + 0 + 1 + 1 + 1 + 1 + 3 + 3 + 4 + 4 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20111133443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 478836490 + ... + 478836531.

It is an arithmetic number, because the mean of its divisors is an integer number (3830692088).

Almost surely, 2^20111133441 is an apocalyptic number.

20111133441 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20111133441 is a deficient number, since it is larger than the sum of its proper divisors (10534403263).

20111133441 is an equidigital number, since it uses as much as digits as its factorization.

20111133441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957673031.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 20111133441 its reverse (14433111102), we get a palindrome (34544244543).

The spelling of 20111133441 in words is "twenty billion, one hundred eleven million, one hundred thirty-three thousand, four hundred forty-one".