121335310021 has 2 divisors, whose sum is σ = 121335310022. Its totient is φ = 121335310020.

The previous prime is 121335309983. The next prime is 121335310067. The reversal of 121335310021 is 120013533121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75982922500 + 45352387521 = 275650^2 + 212961^2 .

It is a cyclic number.

It is not a de Polignac number, because 121335310021 - 2²⁷ = 121201092293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121335309974 and 121335310001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121335310321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60667655010 + 60667655011.

It is an arithmetic number, because the mean of its divisors is an integer number (60667655011).

Almost surely, 2^121335310021 is an apocalyptic number.

It is an amenable number.

121335310021 is a deficient number, since it is larger than the sum of its proper divisors (1).

121335310021 is an equidigital number, since it uses as much as digits as its factorization.

121335310021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 22.

Adding to 121335310021 its reverse (120013533121), we get a palindrome (241348843142).

The spelling of 121335310021 in words is "one hundred twenty-one billion, three hundred thirty-five million, three hundred ten thousand, twenty-one".