211221211121121 has 4 divisors (see below), whose sum is σ = 281628281494832. Its totient is φ = 140814140747412.

The previous prime is 211221211121093. The next prime is 211221211121147. The reversal of 211221211121121 is 121121112122112.

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 not a de Polignac number, because 211221211121121 - 2¹³ = 211221211112929 is a prime.

It is a super-2 number, since 2×211221211121121² (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 (211221211121171) 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 3 ways as a sum of consecutive naturals, for example, 35203535186851 + ... + 35203535186856.

It is an arithmetic number, because the mean of its divisors is an integer number (70407070373708).

Almost surely, 2^{211221211121121} is an apocalyptic number.

It is an amenable number.

211221211121121 is a deficient number, since it is larger than the sum of its proper divisors (70407070373711).

211221211121121 is an equidigital number, since it uses as much as digits as its factorization.

211221211121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70407070373710.

The product of its digits is 64, while the sum is 21.

Adding to 211221211121121 its reverse (121121112122112), we get a palindrome (332342323243233).

The spelling of 211221211121121 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred eleven million, one hundred twenty-one thousand, one hundred twenty-one".