2101211211220 has 24 divisors (see below), whose sum is σ = 4813683866208. Its totient is φ = 764076804000.

The previous prime is 2101211211199. The next prime is 2101211211221. The reversal of 2101211211220 is 221121121012.

It is a junction number, because it is equal to n+sod(n) for n = 2101211211194 and 2101211211203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101211211221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4775479806 + ... + 4775480245.

It is an arithmetic number, because the mean of its divisors is an integer number (200570161092).

Almost surely, 2^{2101211211220} is an apocalyptic number.

2101211211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2101211211220 is an abundant number, since it is smaller than the sum of its proper divisors (2712472654988).

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

2101211211220 is a wasteful number, since it uses less digits than its factorization.

2101211211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9550960071 (or 9550960069 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 2101211211220 its reverse (221121121012), we get a palindrome (2322332332232).

The spelling of 2101211211220 in words is "two trillion, one hundred one billion, two hundred eleven million, two hundred eleven thousand, two hundred twenty".