211122121221221 has 32 divisors (see below), whose sum is σ = 246058221312000. Its totient is φ = 177386233227840.

The previous prime is 211122121221217. The next prime is 211122121221259. The reversal of 211122121221221 is 122122121221112.

It is not a de Polignac number, because 211122121221221 - 2² = 211122121221217 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 (211122121221281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2328190760 + ... + 2328281438.

It is an arithmetic number, because the mean of its divisors is an integer number (7689319416000).

Almost surely, 2^{211122121221221} is an apocalyptic number.

It is an amenable number.

211122121221221 is a deficient number, since it is larger than the sum of its proper divisors (34936100090779).

211122121221221 is a wasteful number, since it uses less digits than its factorization.

211122121221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96369.

The product of its digits is 256, while the sum is 23.

Adding to 211122121221221 its reverse (122122121221112), we get a palindrome (333244242442333).

The spelling of 211122121221221 in words is "two hundred eleven trillion, one hundred twenty-two billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".