21330113177557 has 2 divisors, whose sum is σ = 21330113177558. Its totient is φ = 21330113177556.

The previous prime is 21330113177551. The next prime is 21330113177561. The reversal of 21330113177557 is 75577131103312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21235746867076 + 94366310481 = 4608226^2 + 307191^2 .

It is a cyclic number.

It is not a de Polignac number, because 21330113177557 - 2¹⁵ = 21330113144789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21330113177551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665056588778 + 10665056588779.

It is an arithmetic number, because the mean of its divisors is an integer number (10665056588779).

Almost surely, 2^{21330113177557} is an apocalyptic number.

It is an amenable number.

21330113177557 is a deficient number, since it is larger than the sum of its proper divisors (1).

21330113177557 is an equidigital number, since it uses as much as digits as its factorization.

21330113177557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 463050, while the sum is 46.

The spelling of 21330113177557 in words is "twenty-one trillion, three hundred thirty billion, one hundred thirteen million, one hundred seventy-seven thousand, five hundred fifty-seven".