21155002552039 has 2 divisors, whose sum is σ = 21155002552040. Its totient is φ = 21155002552038.

The previous prime is 21155002552001. The next prime is 21155002552133. The reversal of 21155002552039 is 93025520055112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21155002552039 - 2³⁷ = 21017563598567 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21155002551992 and 21155002552010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21155002553039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10577501276019 + 10577501276020.

It is an arithmetic number, because the mean of its divisors is an integer number (10577501276020).

Almost surely, 2^{21155002552039} is an apocalyptic number.

21155002552039 is a deficient number, since it is larger than the sum of its proper divisors (1).

21155002552039 is an equidigital number, since it uses as much as digits as its factorization.

21155002552039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 135000, while the sum is 40.

The spelling of 21155002552039 in words is "twenty-one trillion, one hundred fifty-five billion, two million, five hundred fifty-two thousand, thirty-nine".