211221221100121 has 8 divisors (see below), whose sum is σ = 211310361131264. Its totient is φ = 211132097579520.

The previous prime is 211221221100079. The next prime is 211221221100137. The reversal of 211221221100121 is 121001122122112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211221221100121 is a prime.

It is a super-2 number, since 2×211221221100121² (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 (211221221100151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21497536 + ... + 29741998.

It is an arithmetic number, because the mean of its divisors is an integer number (26413795141408).

Almost surely, 2^{211221221100121} is an apocalyptic number.

It is an amenable number.

211221221100121 is a deficient number, since it is larger than the sum of its proper divisors (89140031143).

211221221100121 is an equidigital number, since it uses as much as digits as its factorization.

211221221100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8255271.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 211221221100121 its reverse (121001122122112), we get a palindrome (332222343222233).

The spelling of 211221221100121 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred thousand, one hundred twenty-one".