211322211021221 has 4 divisors (see below), whose sum is σ = 214476273872352. Its totient is φ = 208168148170092.

The previous prime is 211322211021211. The next prime is 211322211021241. The reversal of 211322211021221 is 122120112223112.

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 211322211021221 - 2¹⁰ = 211322211020197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211322211021211) 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, 1577031425465 + ... + 1577031425598.

It is an arithmetic number, because the mean of its divisors is an integer number (53619068468088).

Almost surely, 2^{211322211021221} is an apocalyptic number.

It is an amenable number.

211322211021221 is a deficient number, since it is larger than the sum of its proper divisors (3154062851131).

211322211021221 is an equidigital number, since it uses as much as digits as its factorization.

211322211021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3154062851130.

The product of its (nonzero) digits is 384, while the sum is 23.

Adding to 211322211021221 its reverse (122120112223112), we get a palindrome (333442323244333).

The spelling of 211322211021221 in words is "two hundred eleven trillion, three hundred twenty-two billion, two hundred eleven million, twenty-one thousand, two hundred twenty-one".