21042451055039 has 2 divisors, whose sum is σ = 21042451055040. Its totient is φ = 21042451055038.

The previous prime is 21042451054987. The next prime is 21042451055089. The reversal of 21042451055039 is 93055015424012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21042451055039 - 2²⁰ = 21042450006463 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21042451054987 and 21042451055005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21042451055089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10521225527519 + 10521225527520.

It is an arithmetic number, because the mean of its divisors is an integer number (10521225527520).

Almost surely, 2^{21042451055039} is an apocalyptic number.

21042451055039 is a deficient number, since it is larger than the sum of its proper divisors (1).

21042451055039 is an equidigital number, since it uses as much as digits as its factorization.

21042451055039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216000, while the sum is 41.

The spelling of 21042451055039 in words is "twenty-one trillion, forty-two billion, four hundred fifty-one million, fifty-five thousand, thirty-nine".