21063153651539 has 2 divisors, whose sum is σ = 21063153651540. Its totient is φ = 21063153651538.

The previous prime is 21063153651523. The next prime is 21063153651557. The reversal of 21063153651539 is 93515635136012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21063153651539 - 2⁴ = 21063153651523 is a prime.

It is not a weakly prime, because it can be changed into another prime (21063153659539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10531576825769 + 10531576825770.

It is an arithmetic number, because the mean of its divisors is an integer number (10531576825770).

Almost surely, 2^{21063153651539} is an apocalyptic number.

21063153651539 is a deficient number, since it is larger than the sum of its proper divisors (1).

21063153651539 is an equidigital number, since it uses as much as digits as its factorization.

21063153651539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2187000, while the sum is 50.

The spelling of 21063153651539 in words is "twenty-one trillion, sixty-three billion, one hundred fifty-three million, six hundred fifty-one thousand, five hundred thirty-nine".