211201120011221 has 4 divisors (see below), whose sum is σ = 211947413721792. Its totient is φ = 210454826300652.

The previous prime is 211201120011199. The next prime is 211201120011253. The reversal of 211201120011221 is 122110021102112.

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 211201120011221 - 2⁶ = 211201120011157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211201120011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211201120011281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 373146854861 + ... + 373146855426.

It is an arithmetic number, because the mean of its divisors is an integer number (52986853430448).

Almost surely, 2^{211201120011221} is an apocalyptic number.

It is an amenable number.

211201120011221 is a deficient number, since it is larger than the sum of its proper divisors (746293710571).

211201120011221 is an equidigital number, since it uses as much as digits as its factorization.

211201120011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746293710570.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 211201120011221 its reverse (122110021102112), we get a palindrome (333311141113333).

The spelling of 211201120011221 in words is "two hundred eleven trillion, two hundred one billion, one hundred twenty million, eleven thousand, two hundred twenty-one".