20111210101220 has 96 divisors (see below), whose sum is σ = 49308536954880. Its totient is φ = 6746554730880.

The previous prime is 20111210101217. The next prime is 20111210101231. The reversal of 20111210101220 is 2210101211102.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 20111210101195 and 20111210101204.

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, 21727841 + ... + 22634519.

It is an arithmetic number, because the mean of its divisors is an integer number (513630593280).

Almost surely, 2^{20111210101220} is an apocalyptic number.

20111210101220 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 20111210101220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24654268477440).

20111210101220 is an abundant number, since it is smaller than the sum of its proper divisors (29197326853660).

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

20111210101220 is a wasteful number, since it uses less digits than its factorization.

20111210101220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910113 (or 910111 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20111210101220 its reverse (2210101211102), we get a palindrome (22321311312322).

The spelling of 20111210101220 in words is "twenty trillion, one hundred eleven billion, two hundred ten million, one hundred one thousand, two hundred twenty".