121220220001261 has 2 divisors, whose sum is σ = 121220220001262. Its totient is φ = 121220220001260.

The previous prime is 121220220001249. The next prime is 121220220001301. The reversal of 121220220001261 is 162100022022121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72501648744100 + 48718571257161 = 8514790^2 + 6979869^2 .

It is a cyclic number.

It is not a de Polignac number, because 121220220001261 - 2²⁹ = 121219683130349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121220220601261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610110000630 + 60610110000631.

It is an arithmetic number, because the mean of its divisors is an integer number (60610110000631).

Almost surely, 2^{121220220001261} is an apocalyptic number.

It is an amenable number.

121220220001261 is a deficient number, since it is larger than the sum of its proper divisors (1).

121220220001261 is an equidigital number, since it uses as much as digits as its factorization.

121220220001261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 121220220001261 its reverse (162100022022121), we get a palindrome (283320242023382).

The spelling of 121220220001261 in words is "one hundred twenty-one trillion, two hundred twenty billion, two hundred twenty million, one thousand, two hundred sixty-one".