211201220 has 24 divisors (see below), whose sum is σ = 443859864. Its totient is φ = 84416256.

The previous prime is 211201147. The next prime is 211201223. The reversal of 211201220 is 22102112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 33085504 + 178115716 = 5752^2 + 13346^2 .

It is not an unprimeable number, because it can be changed into a prime (211201223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29954 + ... + 36326.

It is an arithmetic number, because the mean of its divisors is an integer number (18494161).

Almost surely, 2^211201220 is an apocalyptic number.

211201220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211201220 is an abundant number, since it is smaller than the sum of its proper divisors (232658644).

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

211201220 is a wasteful number, since it uses less digits than its factorization.

211201220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8039 (or 8037 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 211201220 is about 14532.7636738509. The cubic root of 211201220 is about 595.5233678604.

Adding to 211201220 its reverse (22102112), we get a palindrome (233303332).

The spelling of 211201220 in words is "two hundred eleven million, two hundred one thousand, two hundred twenty".