21136319 has 2 divisors, whose sum is σ = 21136320. Its totient is φ = 21136318.

The previous prime is 21136277. The next prime is 21136369. The reversal of 21136319 is 91363112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21136319 is a prime.

It is a super-2 number, since 2×21136319² = 893487961739522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21136369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10568159 + 10568160.

It is an arithmetic number, because the mean of its divisors is an integer number (10568160).

Almost surely, 2^21136319 is an apocalyptic number.

21136319 is a deficient number, since it is larger than the sum of its proper divisors (1).

21136319 is an equidigital number, since it uses as much as digits as its factorization.

21136319 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972, while the sum is 26.

The square root of 21136319 is about 4597.4252576850. The cubic root of 21136319 is about 276.4881048089.

The spelling of 21136319 in words is "twenty-one million, one hundred thirty-six thousand, three hundred nineteen".