121201021121 has 2 divisors, whose sum is σ = 121201021122. Its totient is φ = 121201021120.

The previous prime is 121201021087. The next prime is 121201021171. The reversal of 121201021121 is 121120102121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114568710400 + 6632310721 = 338480^2 + 81439^2 .

It is a cyclic number.

It is not a de Polignac number, because 121201021121 - 2³⁰ = 120127279297 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121201021096 and 121201021105.

It is not a weakly prime, because it can be changed into another prime (121201021171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60600510560 + 60600510561.

It is an arithmetic number, because the mean of its divisors is an integer number (60600510561).

Almost surely, 2^121201021121 is an apocalyptic number.

It is an amenable number.

121201021121 is a deficient number, since it is larger than the sum of its proper divisors (1).

121201021121 is an equidigital number, since it uses as much as digits as its factorization.

121201021121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121201021121 its reverse (121120102121), we get a palindrome (242321123242).

The spelling of 121201021121 in words is "one hundred twenty-one billion, two hundred one million, twenty-one thousand, one hundred twenty-one".