2111211100221 has 4 divisors (see below), whose sum is σ = 2814948133632. Its totient is φ = 1407474066812.

The previous prime is 2111211100211. The next prime is 2111211100231. The reversal of 2111211100221 is 1220011121112.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (2111211100211) and next prime (2111211100231).

It is a cyclic number.

It is not a de Polignac number, because 2111211100221 - 2⁵ = 2111211100189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2111211100221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111211100211) 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, 351868516701 + ... + 351868516706.

It is an arithmetic number, because the mean of its divisors is an integer number (703737033408).

Almost surely, 2^{2111211100221} is an apocalyptic number.

It is an amenable number.

2111211100221 is a deficient number, since it is larger than the sum of its proper divisors (703737033411).

2111211100221 is an equidigital number, since it uses as much as digits as its factorization.

2111211100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703737033410.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 2111211100221 its reverse (1220011121112), we get a palindrome (3331222221333).

The spelling of 2111211100221 in words is "two trillion, one hundred eleven billion, two hundred eleven million, one hundred thousand, two hundred twenty-one".