201211211120 has 80 divisors (see below), whose sum is σ = 475362432000. Its totient is φ = 79190764800.

The previous prime is 201211211111. The next prime is 201211211129. The reversal of 201211211120 is 21112112102.

It is an interprime number because it is at equal distance from previous prime (201211211111) and next prime (201211211129).

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 201211211095 and 201211211104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201211211129) 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, 2798825 + ... + 2869815.

It is an arithmetic number, because the mean of its divisors is an integer number (5942030400).

Almost surely, 2^201211211120 is an apocalyptic number.

201211211120 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 201211211120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (237681216000).

201211211120 is an abundant number, since it is smaller than the sum of its proper divisors (274151220880).

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

201211211120 is a wasteful number, since it uses less digits than its factorization.

201211211120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71574 (or 71568 counting only the distinct ones).

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

Adding to 201211211120 its reverse (21112112102), we get a palindrome (222323323222).

The spelling of 201211211120 in words is "two hundred one billion, two hundred eleven million, two hundred eleven thousand, one hundred twenty".