21135610219 has 2 divisors, whose sum is σ = 21135610220. Its totient is φ = 21135610218.

The previous prime is 21135610201. The next prime is 21135610253. The reversal of 21135610219 is 91201653112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21135610219 - 2¹⁷ = 21135479147 is a prime.

It is a super-2 number, since 2×21135610219² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21135610019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10567805109 + 10567805110.

It is an arithmetic number, because the mean of its divisors is an integer number (10567805110).

Almost surely, 2^21135610219 is an apocalyptic number.

21135610219 is a deficient number, since it is larger than the sum of its proper divisors (1).

21135610219 is an equidigital number, since it uses as much as digits as its factorization.

21135610219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 31.

The spelling of 21135610219 in words is "twenty-one billion, one hundred thirty-five million, six hundred ten thousand, two hundred nineteen".