201011211221 has 4 divisors (see below), whose sum is σ = 201014540832. Its totient is φ = 201007881612.

The previous prime is 201011211187. The next prime is 201011211293. The reversal of 201011211221 is 122112110102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201011211221 - 2⁶ = 201011211157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 201011211196 and 201011211205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201011217221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1572545 + ... + 1695558.

It is an arithmetic number, because the mean of its divisors is an integer number (50253635208).

Almost surely, 2^201011211221 is an apocalyptic number.

It is an amenable number.

201011211221 is a deficient number, since it is larger than the sum of its proper divisors (3329611).

201011211221 is an equidigital number, since it uses as much as digits as its factorization.

201011211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3329610.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 201011211221 its reverse (122112110102), we get a palindrome (323123321323).

The spelling of 201011211221 in words is "two hundred one billion, eleven million, two hundred eleven thousand, two hundred twenty-one".