121220222121 has 6 divisors (see below), whose sum is σ = 175095876410. Its totient is φ = 80813481408.

The previous prime is 121220222113. The next prime is 121220222147. The reversal of 121220222121 is 121222022121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 121218867225 + 1354896 = 348165^2 + 1164^2 .

It is not a de Polignac number, because 121220222121 - 2³ = 121220222113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121220222094 and 121220222103.

It is not an unprimeable number, because it can be changed into a prime (121220222521) 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, 6734456776 + ... + 6734456793.

Almost surely, 2^121220222121 is an apocalyptic number.

It is an amenable number.

121220222121 is a deficient number, since it is larger than the sum of its proper divisors (53875654289).

121220222121 is a wasteful number, since it uses less digits than its factorization.

121220222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13468913575 (or 13468913572 counting only the distinct ones).

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

Adding to 121220222121 its reverse (121222022121), we get a palindrome (242442244242).

The spelling of 121220222121 in words is "one hundred twenty-one billion, two hundred twenty million, two hundred twenty-two thousand, one hundred twenty-one".