21136016329 has 2 divisors, whose sum is σ = 21136016330. Its totient is φ = 21136016328.

The previous prime is 21136016323. The next prime is 21136016353. The reversal of 21136016329 is 92361063112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20150370304 + 985646025 = 141952^2 + 31395^2 .

It is a cyclic number.

It is not a de Polignac number, because 21136016329 - 2¹³ = 21136008137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21136016294 and 21136016303.

It is not a weakly prime, because it can be changed into another prime (21136016323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10568008164 + 10568008165.

It is an arithmetic number, because the mean of its divisors is an integer number (10568008165).

Almost surely, 2^21136016329 is an apocalyptic number.

It is an amenable number.

21136016329 is a deficient number, since it is larger than the sum of its proper divisors (1).

21136016329 is an equidigital number, since it uses as much as digits as its factorization.

21136016329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 34.

The spelling of 21136016329 in words is "twenty-one billion, one hundred thirty-six million, sixteen thousand, three hundred twenty-nine".