121102222221 has 12 divisors (see below), whose sum is σ = 179653146972. Its totient is φ = 78552792576.

The previous prime is 121102222181. The next prime is 121102222237. The reversal of 121102222221 is 122222201121.

It is a happy number.

121102222221 is a `hidden beast` number, since 121 + 102 + 222 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 71200917225 + 49901304996 = 266835^2 + 223386^2 .

It is not a de Polignac number, because 121102222221 - 2⁷ = 121102222093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121102222194 and 121102222203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121102262221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 181834836 + ... + 181835501.

It is an arithmetic number, because the mean of its divisors is an integer number (14971095581).

Almost surely, 2^121102222221 is an apocalyptic number.

It is an amenable number.

121102222221 is a deficient number, since it is larger than the sum of its proper divisors (58550924751).

121102222221 is a wasteful number, since it uses less digits than its factorization.

121102222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363670380 (or 363670377 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 121102222221 its reverse (122222201121), we get a palindrome (243324423342).

The spelling of 121102222221 in words is "one hundred twenty-one billion, one hundred two million, two hundred twenty-two thousand, two hundred twenty-one".