211220221222201 has 4 divisors (see below), whose sum is σ = 213593482134900. Its totient is φ = 208846960309504.

The previous prime is 211220221222183. The next prime is 211220221222229. The reversal of 211220221222201 is 102222122022112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39604064166976 + 171616157055225 = 6293176^2 + 13100235^2 .

It is a cyclic number.

It is not a de Polignac number, because 211220221222201 - 2⁹ = 211220221221689 is a prime.

It is a super-2 number, since 2×211220221222201² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211220221222301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1186630456216 + ... + 1186630456393.

It is an arithmetic number, because the mean of its divisors is an integer number (53398370533725).

Almost surely, 2^{211220221222201} is an apocalyptic number.

It is an amenable number.

211220221222201 is a deficient number, since it is larger than the sum of its proper divisors (2373260912699).

211220221222201 is an equidigital number, since it uses as much as digits as its factorization.

211220221222201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2373260912698.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 211220221222201 its reverse (102222122022112), we get a palindrome (313442343244313).

The spelling of 211220221222201 in words is "two hundred eleven trillion, two hundred twenty billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred one".