20111000001222 has 64 divisors (see below), whose sum is σ = 43871133841920. Its totient is φ = 6108808280064.

The previous prime is 20111000001199. The next prime is 20111000001247. The reversal of 20111000001222 is 22210000011102.

It is a junction number, because it is equal to n+sod(n) for n = 20111000001198 and 20111000001207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7361638 + ... + 9716774.

It is an arithmetic number, because the mean of its divisors is an integer number (685486466280).

Almost surely, 2^{20111000001222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20111000001222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21935566920960).

20111000001222 is an abundant number, since it is smaller than the sum of its proper divisors (23760133840698).

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

20111000001222 is a wasteful number, since it uses less digits than its factorization.

20111000001222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2356557.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20111000001222 its reverse (22210000011102), we get a palindrome (42321000012324).

The spelling of 20111000001222 in words is "twenty trillion, one hundred eleven billion, one thousand, two hundred twenty-two".