21000535251539 has 2 divisors, whose sum is σ = 21000535251540. Its totient is φ = 21000535251538.

The previous prime is 21000535251533. The next prime is 21000535251559. The reversal of 21000535251539 is 93515253500012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21000535251539 - 2¹² = 21000535247443 is a prime.

It is a super-2 number, since 2×21000535251539² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21000535251496 and 21000535251505.

It is not a weakly prime, because it can be changed into another prime (21000535251533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500267625769 + 10500267625770.

It is an arithmetic number, because the mean of its divisors is an integer number (10500267625770).

Almost surely, 2^{21000535251539} is an apocalyptic number.

21000535251539 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000535251539 is an equidigital number, since it uses as much as digits as its factorization.

21000535251539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 202500, while the sum is 41.

The spelling of 21000535251539 in words is "twenty-one trillion, five hundred thirty-five million, two hundred fifty-one thousand, five hundred thirty-nine".