1221202202123 has 2 divisors, whose sum is σ = 1221202202124. Its totient is φ = 1221202202122.

The previous prime is 1221202202053. The next prime is 1221202202153. The reversal of 1221202202123 is 3212022021221.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221202202123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221202202095 and 1221202202104.

It is not a weakly prime, because it can be changed into another prime (1221202202153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610601101061 + 610601101062.

It is an arithmetic number, because the mean of its divisors is an integer number (610601101062).

Almost surely, 2^{1221202202123} is an apocalyptic number.

1221202202123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221202202123 is an equidigital number, since it uses as much as digits as its factorization.

1221202202123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 1221202202123 its reverse (3212022021221), we get a palindrome (4433224223344).

The spelling of 1221202202123 in words is "one trillion, two hundred twenty-one billion, two hundred two million, two hundred two thousand, one hundred twenty-three".