201220311 has 8 divisors (see below), whose sum is σ = 268359280. Its totient is φ = 134114112.

The previous prime is 201220309. The next prime is 201220321. The reversal of 201220311 is 113022102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 201220311 - 2¹ = 201220309 is a prime.

It is a super-2 number, since 2×201220311² = 80979227117873442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201220321) 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, 19995 + ... + 28323.

It is an arithmetic number, because the mean of its divisors is an integer number (33544910).

Almost surely, 2^201220311 is an apocalyptic number.

201220311 is a deficient number, since it is larger than the sum of its proper divisors (67138969).

201220311 is an equidigital number, since it uses as much as digits as its factorization.

201220311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16385.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 201220311 is about 14185.2145207607. The cubic root of 201220311 is about 585.9905404088.

Adding to 201220311 its reverse (113022102), we get a palindrome (314242413).

The spelling of 201220311 in words is "two hundred one million, two hundred twenty thousand, three hundred eleven".