21351212359 has 2 divisors, whose sum is σ = 21351212360. Its totient is φ = 21351212358.

The previous prime is 21351212297. The next prime is 21351212417. The reversal of 21351212359 is 95321215312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21351212359 - 2²⁹ = 20814341447 is a prime.

It is a super-2 number, since 2×21351212359² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21351212059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10675606179 + 10675606180.

It is an arithmetic number, because the mean of its divisors is an integer number (10675606180).

Almost surely, 2^21351212359 is an apocalyptic number.

21351212359 is a deficient number, since it is larger than the sum of its proper divisors (1).

21351212359 is an equidigital number, since it uses as much as digits as its factorization.

21351212359 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 34.

The spelling of 21351212359 in words is "twenty-one billion, three hundred fifty-one million, two hundred twelve thousand, three hundred fifty-nine".