1234123505221 has 2 divisors, whose sum is σ = 1234123505222. Its totient is φ = 1234123505220.

The previous prime is 1234123505189. The next prime is 1234123505239. The reversal of 1234123505221 is 1225053214321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 914882685025 + 319240820196 = 956495^2 + 565014^2 .

It is a cyclic number.

It is not a de Polignac number, because 1234123505221 - 2⁵ = 1234123505189 is a prime.

It is a super-2 number, since 2×1234123505221² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1234123505621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 617061752610 + 617061752611.

It is an arithmetic number, because the mean of its divisors is an integer number (617061752611).

Almost surely, 2^{1234123505221} is an apocalyptic number.

It is an amenable number.

1234123505221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1234123505221 is an equidigital number, since it uses as much as digits as its factorization.

1234123505221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 1234123505221 its reverse (1225053214321), we get a palindrome (2459176719542).

The spelling of 1234123505221 in words is "one trillion, two hundred thirty-four billion, one hundred twenty-three million, five hundred five thousand, two hundred twenty-one".