1221212102039 has 2 divisors, whose sum is σ = 1221212102040. Its totient is φ = 1221212102038.

The previous prime is 1221212101997. The next prime is 1221212102041. The reversal of 1221212102039 is 9302012121221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221212102039 - 2²⁴ = 1221195324823 is a prime.

Together with 1221212102041, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221212101999 and 1221212102017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221212182039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610606051019 + 610606051020.

It is an arithmetic number, because the mean of its divisors is an integer number (610606051020).

Almost surely, 2^{1221212102039} is an apocalyptic number.

1221212102039 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221212102039 is an equidigital number, since it uses as much as digits as its factorization.

1221212102039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 1221212102039 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, one hundred two thousand, thirty-nine".