121212001021 has 2 divisors, whose sum is σ = 121212001022. Its totient is φ = 121212001020.

The previous prime is 121212001013. The next prime is 121212001037. The reversal of 121212001021 is 120100212121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114251436121 + 6960564900 = 338011^2 + 83430^2 .

It is a cyclic number.

It is not a de Polignac number, because 121212001021 - 2³ = 121212001013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121212000992 and 121212001010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121212001051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60606000510 + 60606000511.

It is an arithmetic number, because the mean of its divisors is an integer number (60606000511).

Almost surely, 2^121212001021 is an apocalyptic number.

It is an amenable number.

121212001021 is a deficient number, since it is larger than the sum of its proper divisors (1).

121212001021 is an equidigital number, since it uses as much as digits as its factorization.

121212001021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121212001021 its reverse (120100212121), we get a palindrome (241312213142).

The spelling of 121212001021 in words is "one hundred twenty-one billion, two hundred twelve million, one thousand, twenty-one".