20111232331331 has 4 divisors (see below), whose sum is σ = 20140336865064. Its totient is φ = 20082127797600.

The previous prime is 20111232331279. The next prime is 20111232331369. The reversal of 20111232331331 is 13313323211102.

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

It is not a de Polignac number, because 20111232331331 - 2³⁴ = 20094052462147 is a prime.

It is a super-2 number, since 2×20111232331331² (a number of 27 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 20111232331331.

It is not an unprimeable number, because it can be changed into a prime (20111232331831) 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, 14552265830 + ... + 14552267211.

It is an arithmetic number, because the mean of its divisors is an integer number (5035084216266).

Almost surely, 2^{20111232331331} is an apocalyptic number.

20111232331331 is a deficient number, since it is larger than the sum of its proper divisors (29104533733).

20111232331331 is an equidigital number, since it uses as much as digits as its factorization.

20111232331331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29104533732.

The product of its (nonzero) digits is 1944, while the sum is 26.

Adding to 20111232331331 its reverse (13313323211102), we get a palindrome (33424555542433).

The spelling of 20111232331331 in words is "twenty trillion, one hundred eleven billion, two hundred thirty-two million, three hundred thirty-one thousand, three hundred thirty-one".