20111220010000 has 400 divisors, whose sum is σ = 58113335579904. Its totient is φ = 6590174976000.

The previous prime is 20111220009961. The next prime is 20111220010001. The reversal of 20111220010000 is 1002211102.

It is a tau number, because it is divible by the number of its divisors (400).

It is a super-2 number, since 2×20111220010000² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (20111220010001) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2339325702 + ... + 2339334298.

Almost surely, 2^{20111220010000} is an apocalyptic number.

20111220010000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20111220010000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29056667789952).

20111220010000 is an abundant number, since it is smaller than the sum of its proper divisors (38002115569904).

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

20111220010000 is a wasteful number, since it uses less digits than its factorization.

20111220010000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10108 (or 10087 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20111220010000 its reverse (1002211102), we get a palindrome (20112222221102).

The spelling of 20111220010000 in words is "twenty trillion, one hundred eleven billion, two hundred twenty million, ten thousand".