21104255577133 has 2 divisors, whose sum is σ = 21104255577134. Its totient is φ = 21104255577132.

The previous prime is 21104255577131. The next prime is 21104255577191. The reversal of 21104255577133 is 33177555240112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12959978400009 + 8144277177124 = 3599997^2 + 2853818^2 .

It is a cyclic number.

It is not a de Polignac number, because 21104255577133 - 2¹ = 21104255577131 is a prime.

Together with 21104255577131, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21104255577131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10552127788566 + 10552127788567.

It is an arithmetic number, because the mean of its divisors is an integer number (10552127788567).

Almost surely, 2^{21104255577133} is an apocalyptic number.

It is an amenable number.

21104255577133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21104255577133 is an equidigital number, since it uses as much as digits as its factorization.

21104255577133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 882000, while the sum is 46.

The spelling of 21104255577133 in words is "twenty-one trillion, one hundred four billion, two hundred fifty-five million, five hundred seventy-seven thousand, one hundred thirty-three".