20110101216 has 96 divisors (see below), whose sum is σ = 53839997568. Its totient is φ = 6570170880.

The previous prime is 20110101199. The next prime is 20110101217. The reversal of 20110101216 is 61210101102.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 20110101195 and 20110101204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20110101217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8480511 + ... + 8482881.

It is an arithmetic number, because the mean of its divisors is an integer number (560833308).

Almost surely, 2^20110101216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20110101216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26919998784).

20110101216 is an abundant number, since it is smaller than the sum of its proper divisors (33729896352).

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

20110101216 is a wasteful number, since it uses less digits than its factorization.

20110101216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4104 (or 4096 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 20110101216 its reverse (61210101102), we get a palindrome (81320202318).

The spelling of 20110101216 in words is "twenty billion, one hundred ten million, one hundred one thousand, two hundred sixteen".