211222211221201 has 4 divisors (see below), whose sum is σ = 218505735746100. Its totient is φ = 203938686696304.

The previous prime is 211222211221199. The next prime is 211222211221211. The reversal of 211222211221201 is 102122112222112.

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 57035951406225 + 154186259814976 = 7552215^2 + 12417176^2 .

It is a cyclic number.

It is not a de Polignac number, because 211222211221201 - 2¹ = 211222211221199 is a prime.

It is a super-2 number, since 2×211222211221201² (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 (211222211221211) 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, 3641762262406 + ... + 3641762262463.

It is an arithmetic number, because the mean of its divisors is an integer number (54626433936525).

Almost surely, 2^{211222211221201} is an apocalyptic number.

It is an amenable number.

211222211221201 is a deficient number, since it is larger than the sum of its proper divisors (7283524524899).

211222211221201 is an equidigital number, since it uses as much as digits as its factorization.

211222211221201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7283524524898.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 211222211221201 its reverse (102122112222112), we get a palindrome (313344323443313).

The spelling of 211222211221201 in words is "two hundred eleven trillion, two hundred twenty-two billion, two hundred eleven million, two hundred twenty-one thousand, two hundred one".