211201011220 has 24 divisors (see below), whose sum is σ = 451890467784. Its totient is φ = 82886434176.

The previous prime is 211201011191. The next prime is 211201011227. The reversal of 211201011220 is 22110102112.

It can be written as a sum of positive squares in 4 ways, for example, as 5923149444 + 205277861776 = 76962^2 + 453076^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 211201011220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211201011227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99622059 + ... + 99624178.

It is an arithmetic number, because the mean of its divisors is an integer number (18828769491).

Almost surely, 2^211201011220 is an apocalyptic number.

211201011220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211201011220 is an abundant number, since it is smaller than the sum of its proper divisors (240689456564).

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

211201011220 is a wasteful number, since it uses less digits than its factorization.

211201011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199246299 (or 199246297 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 211201011220 its reverse (22110102112), we get a palindrome (233311113332).

The spelling of 211201011220 in words is "two hundred eleven billion, two hundred one million, eleven thousand, two hundred twenty".