20011103111231 has 4 divisors (see below), whose sum is σ = 20656622566464. Its totient is φ = 19365583656000.

The previous prime is 20011103111221. The next prime is 20011103111239. The reversal of 20011103111231 is 13211130111002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20011103111231 is a prime.

It is a super-2 number, since 2×20011103111231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011103111239) 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, 322759727570 + ... + 322759727631.

It is an arithmetic number, because the mean of its divisors is an integer number (5164155641616).

Almost surely, 2^{20011103111231} is an apocalyptic number.

20011103111231 is a deficient number, since it is larger than the sum of its proper divisors (645519455233).

20011103111231 is an equidigital number, since it uses as much as digits as its factorization.

20011103111231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645519455232.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 20011103111231 its reverse (13211130111002), we get a palindrome (33222233222233).

The spelling of 20011103111231 in words is "twenty trillion, eleven billion, one hundred three million, one hundred eleven thousand, two hundred thirty-one".