121020212129 has 2 divisors, whose sum is σ = 121020212130. Its totient is φ = 121020212128.

The previous prime is 121020212111. The next prime is 121020212167. The reversal of 121020212129 is 921212020121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106051179025 + 14969033104 = 325655^2 + 122348^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121020212129 is a prime.

It is not a weakly prime, because it can be changed into another prime (121020242129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60510106064 + 60510106065.

It is an arithmetic number, because the mean of its divisors is an integer number (60510106065).

Almost surely, 2^121020212129 is an apocalyptic number.

It is an amenable number.

121020212129 is a deficient number, since it is larger than the sum of its proper divisors (1).

121020212129 is an equidigital number, since it uses as much as digits as its factorization.

121020212129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 121020212129 in words is "one hundred twenty-one billion, twenty million, two hundred twelve thousand, one hundred twenty-nine".