201212111220 has 24 divisors (see below), whose sum is σ = 563393911584. Its totient is φ = 53656562976.

The previous prime is 201212111209. The next prime is 201212111267. The reversal of 201212111220 is 22111212102.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 201212111220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1676767534 + ... + 1676767653.

It is an arithmetic number, because the mean of its divisors is an integer number (23474746316).

Almost surely, 2^201212111220 is an apocalyptic number.

201212111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201212111220 is an abundant number, since it is smaller than the sum of its proper divisors (362181800364).

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

201212111220 is a wasteful number, since it uses less digits than its factorization.

201212111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3353535199 (or 3353535197 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 201212111220 its reverse (22111212102), we get a palindrome (223323323322).

The spelling of 201212111220 in words is "two hundred one billion, two hundred twelve million, one hundred eleven thousand, two hundred twenty".