20111122210110 has 64 divisors (see below), whose sum is σ = 51109558231104. Its totient is φ = 5047137075200.

The previous prime is 20111122210103. The next prime is 20111122210117. The reversal of 20111122210110 is 1101222111102.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20111122210103) and next prime (20111122210117).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20111122210110.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111122210117) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5781070 + ... + 8581550.

It is an arithmetic number, because the mean of its divisors is an integer number (798586847361).

Almost surely, 2^{20111122210110} is an apocalyptic number.

20111122210110 is an abundant number, since it is smaller than the sum of its proper divisors (30998436020994).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20111122210110 is a wasteful number, since it uses less digits than its factorization.

20111122210110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2814589.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 20111122210110 its reverse (1101222111102), we get a palindrome (21212344321212).

The spelling of 20111122210110 in words is "twenty trillion, one hundred eleven billion, one hundred twenty-two million, two hundred ten thousand, one hundred ten".