21155002552133 has 2 divisors, whose sum is σ = 21155002552134. Its totient is φ = 21155002552132.

The previous prime is 21155002552039. The next prime is 21155002552171. The reversal of 21155002552133 is 33125520055112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17929321895809 + 3225680656324 = 4234303^2 + 1796018^2 .

It is a cyclic number.

It is not a de Polignac number, because 21155002552133 - 2¹⁴ = 21155002535749 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21155002552093 and 21155002552102.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21155002552193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10577501276066 + 10577501276067.

It is an arithmetic number, because the mean of its divisors is an integer number (10577501276067).

Almost surely, 2^{21155002552133} is an apocalyptic number.

It is an amenable number.

21155002552133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21155002552133 is an equidigital number, since it uses as much as digits as its factorization.

21155002552133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45000, while the sum is 35.

The spelling of 21155002552133 in words is "twenty-one trillion, one hundred fifty-five billion, two million, five hundred fifty-two thousand, one hundred thirty-three".