211203131220 has 144 divisors (see below), whose sum is σ = 653539985280. Its totient is φ = 55190224128.

The previous prime is 211203131213. The next prime is 211203131239. The reversal of 211203131220 is 22131302112.

211203131220 is a `hidden beast` number, since 211 + 20 + 313 + 122 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 211203131193 and 211203131202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7990867 + ... + 8017253.

It is an arithmetic number, because the mean of its divisors is an integer number (4538472120).

Almost surely, 2^211203131220 is an apocalyptic number.

211203131220 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 211203131220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (326769992640).

211203131220 is an abundant number, since it is smaller than the sum of its proper divisors (442336854060).

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

211203131220 is a wasteful number, since it uses less digits than its factorization.

211203131220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27294 (or 27289 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 211203131220 its reverse (22131302112), we get a palindrome (233334433332).

The spelling of 211203131220 in words is "two hundred eleven billion, two hundred three million, one hundred thirty-one thousand, two hundred twenty".