7735128089021 has 2 divisors, whose sum is σ = 7735128089022. Its totient is φ = 7735128089020.

The previous prime is 7735128088991. The next prime is 7735128089089. The reversal of 7735128089021 is 1209808215377.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4022130525625 + 3712997563396 = 2005525^2 + 1926914^2 .

It is a cyclic number.

It is not a de Polignac number, because 7735128089021 - 2¹⁰ = 7735128087997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7735188089021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3867564044510 + 3867564044511.

It is an arithmetic number, because the mean of its divisors is an integer number (3867564044511).

Almost surely, 2^{7735128089021} is an apocalyptic number.

It is an amenable number.

7735128089021 is a deficient number, since it is larger than the sum of its proper divisors (1).

7735128089021 is an equidigital number, since it uses as much as digits as its factorization.

7735128089021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1693440, while the sum is 53.

The spelling of 7735128089021 in words is "seven trillion, seven hundred thirty-five billion, one hundred twenty-eight million, eighty-nine thousand, twenty-one".