211121011220121 has 6 divisors (see below), whose sum is σ = 304952571762410. Its totient is φ = 140747340813408.

The previous prime is 211121011220113. The next prime is 211121011220129. The reversal of 211121011220121 is 121022110121112.

It is a happy number.

211121011220121 is a `hidden beast` number, since 2 + 111 + 210 + 1 + 1 + 220 + 121 = 666.

It is an interprime number because it is at equal distance from previous prime (211121011220113) and next prime (211121011220129).

It can be written as a sum of positive squares in only one way, i.e., 185734921971600 + 25386089248521 = 13628460^2 + 5038461^2 .

It is not a de Polignac number, because 211121011220121 - 2³ = 211121011220113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211121011220094 and 211121011220103.

It is not an unprimeable number, because it can be changed into a prime (211121011220129) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11728945067776 + ... + 11728945067793.

Almost surely, 2^{211121011220121} is an apocalyptic number.

It is an amenable number.

211121011220121 is a deficient number, since it is larger than the sum of its proper divisors (93831560542289).

211121011220121 is a wasteful number, since it uses less digits than its factorization.

211121011220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23457890135575 (or 23457890135572 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 211121011220121 its reverse (121022110121112), we get a palindrome (332143121341233).

The spelling of 211121011220121 in words is "two hundred eleven trillion, one hundred twenty-one billion, eleven million, two hundred twenty thousand, one hundred twenty-one".