121221020122 has 4 divisors (see below), whose sum is σ = 181831530186. Its totient is φ = 60610510060.

The previous prime is 121221020117. The next prime is 121221020189. The reversal of 121221020122 is 221020122121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 221020122121 = 23 ⋅9609570527.

It can be written as a sum of positive squares in only one way, i.e., 116908602561 + 4312417561 = 341919^2 + 65669^2 .

It is a junction number, because it is equal to n+sod(n) for n = 121221020096 and 121221020105.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30305255029 + ... + 30305255032.

Almost surely, 2^121221020122 is an apocalyptic number.

121221020122 is a deficient number, since it is larger than the sum of its proper divisors (60610510064).

121221020122 is an equidigital number, since it uses as much as digits as its factorization.

121221020122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60610510063.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 121221020122 its reverse (221020122121), we get a palindrome (342241142243).

It can be divided in two parts, 121 and 221020122, that multiplied together give a palindrome (26743434762).

The spelling of 121221020122 in words is "one hundred twenty-one billion, two hundred twenty-one million, twenty thousand, one hundred twenty-two".