211231010220 has 24 divisors (see below), whose sum is σ = 591446828784. Its totient is φ = 56328269376.

The previous prime is 211231010209. The next prime is 211231010239. The reversal of 211231010220 is 22010132112.

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 211231010220.

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, 1760258359 + ... + 1760258478.

It is an arithmetic number, because the mean of its divisors is an integer number (24643617866).

Almost surely, 2^211231010220 is an apocalyptic number.

211231010220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211231010220 is an abundant number, since it is smaller than the sum of its proper divisors (380215818564).

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

211231010220 is a wasteful number, since it uses less digits than its factorization.

211231010220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3520516849 (or 3520516847 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 211231010220 its reverse (22010132112), we get a palindrome (233241142332).

The spelling of 211231010220 in words is "two hundred eleven billion, two hundred thirty-one million, ten thousand, two hundred twenty".