28121926229 has 2 divisors, whose sum is σ = 28121926230. Its totient is φ = 28121926228.

The previous prime is 28121926223. The next prime is 28121926237. The reversal of 28121926229 is 92262912182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26085480100 + 2036446129 = 161510^2 + 45127^2 .

It is a cyclic number.

It is not a de Polignac number, because 28121926229 - 2³² = 23826958933 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28121926229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28121926223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14060963114 + 14060963115.

It is an arithmetic number, because the mean of its divisors is an integer number (14060963115).

Almost surely, 2^28121926229 is an apocalyptic number.

It is an amenable number.

28121926229 is a deficient number, since it is larger than the sum of its proper divisors (1).

28121926229 is an equidigital number, since it uses as much as digits as its factorization.

28121926229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 44.

The spelling of 28121926229 in words is "twenty-eight billion, one hundred twenty-one million, nine hundred twenty-six thousand, two hundred twenty-nine".