211221120220121 has 8 divisors (see below), whose sum is σ = 230424826257984. Its totient is φ = 192017711851920.

The previous prime is 211221120220109. The next prime is 211221120220133. The reversal of 211221120220121 is 121022021122112.

It is an interprime number because it is at equal distance from previous prime (211221120220109) and next prime (211221120220133).

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-211221120220121 is a prime.

It is a super-2 number, since 2×211221120220121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211221120220093 and 211221120220102.

It is not an unprimeable number, because it can be changed into a prime (211221120220151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72932450 + ... + 75773243.

It is an arithmetic number, because the mean of its divisors is an integer number (28803103282248).

Almost surely, 2^{211221120220121} is an apocalyptic number.

It is an amenable number.

211221120220121 is a deficient number, since it is larger than the sum of its proper divisors (19203706037863).

211221120220121 is a wasteful number, since it uses less digits than its factorization.

211221120220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148834831.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 211221120220121 its reverse (121022021122112), we get a palindrome (332243141342233).

The spelling of 211221120220121 in words is "two hundred eleven trillion, two hundred twenty-one billion, one hundred twenty million, two hundred twenty thousand, one hundred twenty-one".