211011201221 has 4 divisors (see below), whose sum is σ = 211698534432. Its totient is φ = 210323868012.

The previous prime is 211011201211. The next prime is 211011201223. The reversal of 211011201221 is 122102110112.

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 211011201221 - 2³⁰ = 209937459397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211011201196 and 211011201205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211011201223) 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, 343666145 + ... + 343666758.

It is an arithmetic number, because the mean of its divisors is an integer number (52924633608).

Almost surely, 2^211011201221 is an apocalyptic number.

It is an amenable number.

211011201221 is a deficient number, since it is larger than the sum of its proper divisors (687333211).

211011201221 is an equidigital number, since it uses as much as digits as its factorization.

211011201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687333210.

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

Adding to 211011201221 its reverse (122102110112), we get a palindrome (333113311333).

The spelling of 211011201221 in words is "two hundred eleven billion, eleven million, two hundred one thousand, two hundred twenty-one".