1012123421129 has 2 divisors, whose sum is σ = 1012123421130. Its totient is φ = 1012123421128.

The previous prime is 1012123421123. The next prime is 1012123421147. The reversal of 1012123421129 is 9211243212101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 692165761225 + 319957659904 = 831965^2 + 565648^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012123421129 - 2²⁰ = 1012122372553 is a prime.

It is not a weakly prime, because it can be changed into another prime (1012123421123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506061710564 + 506061710565.

It is an arithmetic number, because the mean of its divisors is an integer number (506061710565).

Almost surely, 2^{1012123421129} is an apocalyptic number.

It is an amenable number.

1012123421129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012123421129 is an equidigital number, since it uses as much as digits as its factorization.

1012123421129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 29.

The spelling of 1012123421129 in words is "one trillion, twelve billion, one hundred twenty-three million, four hundred twenty-one thousand, one hundred twenty-nine".