1221201010123 has 2 divisors, whose sum is σ = 1221201010124. Its totient is φ = 1221201010122.

The previous prime is 1221201010097. The next prime is 1221201010147. The reversal of 1221201010123 is 3210101021221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221201010123 - 2⁵ = 1221201010091 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221201010097 and 1221201010106.

It is not a weakly prime, because it can be changed into another prime (1221201010223) 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, 610600505061 + 610600505062.

It is an arithmetic number, because the mean of its divisors is an integer number (610600505062).

Almost surely, 2^{1221201010123} is an apocalyptic number.

1221201010123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221201010123 is an equidigital number, since it uses as much as digits as its factorization.

1221201010123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 1221201010123 its reverse (3210101021221), we get a palindrome (4431302031344).

The spelling of 1221201010123 in words is "one trillion, two hundred twenty-one billion, two hundred one million, ten thousand, one hundred twenty-three".