128924274418921 has 2 divisors, whose sum is σ = 128924274418922. Its totient is φ = 128924274418920.

The previous prime is 128924274418879. The next prime is 128924274418937. The reversal of 128924274418921 is 129814472429821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110609392410000 + 18314882008921 = 10517100^2 + 4279589^2 .

It is a cyclic number.

It is not a de Polignac number, because 128924274418921 - 2²¹ = 128924272321769 is a prime.

It is not a weakly prime, because it can be changed into another prime (128924274418021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64462137209460 + 64462137209461.

It is an arithmetic number, because the mean of its divisors is an integer number (64462137209461).

Almost surely, 2^{128924274418921} is an apocalyptic number.

It is an amenable number.

128924274418921 is a deficient number, since it is larger than the sum of its proper divisors (1).

128924274418921 is an equidigital number, since it uses as much as digits as its factorization.

128924274418921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37158912, while the sum is 64.

The spelling of 128924274418921 in words is "one hundred twenty-eight trillion, nine hundred twenty-four billion, two hundred seventy-four million, four hundred eighteen thousand, nine hundred twenty-one".