211222311131221 has 4 divisors (see below), whose sum is σ = 227470181218252. Its totient is φ = 194974441044192.

The previous prime is 211222311131171. The next prime is 211222311131261. The reversal of 211222311131221 is 122131113222112.

It is a happy number.

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 28198914370225 + 183023396760996 = 5310265^2 + 13528614^2 .

It is a cyclic number.

It is not a de Polignac number, because 211222311131221 - 2²¹ = 211222309034069 is a prime.

It is a super-2 number, since 2×211222311131221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211222311131261) 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, 8123935043496 + ... + 8123935043521.

It is an arithmetic number, because the mean of its divisors is an integer number (56867545304563).

Almost surely, 2^{211222311131221} is an apocalyptic number.

It is an amenable number.

211222311131221 is a deficient number, since it is larger than the sum of its proper divisors (16247870087031).

211222311131221 is a wasteful number, since it uses less digits than its factorization.

211222311131221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16247870087030.

The product of its digits is 576, while the sum is 25.

Adding to 211222311131221 its reverse (122131113222112), we get a palindrome (333353424353333).

The spelling of 211222311131221 in words is "two hundred eleven trillion, two hundred twenty-two billion, three hundred eleven million, one hundred thirty-one thousand, two hundred twenty-one".