121021222221 has 6 divisors (see below), whose sum is σ = 174808432110. Its totient is φ = 80680814808.

The previous prime is 121021222213. The next prime is 121021222249. The reversal of 121021222221 is 122222120121.

It is a happy number.

121021222221 is a `hidden beast` number, since 1 + 210 + 212 + 22 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 119138877225 + 1882344996 = 345165^2 + 43386^2 .

It is not a de Polignac number, because 121021222221 - 2³ = 121021222213 is a prime.

It is a super-2 number, since 2×121021222221² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121021222194 and 121021222203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021222271) 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, 6723401226 + ... + 6723401243.

It is an arithmetic number, because the mean of its divisors is an integer number (29134738685).

Almost surely, 2^121021222221 is an apocalyptic number.

It is an amenable number.

121021222221 is a deficient number, since it is larger than the sum of its proper divisors (53787209889).

121021222221 is a wasteful number, since it uses less digits than its factorization.

121021222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13446802475 (or 13446802472 counting only the distinct ones).

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

Adding to 121021222221 its reverse (122222120121), we get a palindrome (243243342342).

The spelling of 121021222221 in words is "one hundred twenty-one billion, twenty-one million, two hundred twenty-two thousand, two hundred twenty-one".