21136519 has 2 divisors, whose sum is σ = 21136520. Its totient is φ = 21136518.

The previous prime is 21136501. The next prime is 21136523. The reversal of 21136519 is 91563112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21136519 - 2⁹ = 21136007 is a prime.

It is a super-2 number, since 2×21136519² = 893504870874722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21136579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10568259 + 10568260.

It is an arithmetic number, because the mean of its divisors is an integer number (10568260).

Almost surely, 2^21136519 is an apocalyptic number.

21136519 is a deficient number, since it is larger than the sum of its proper divisors (1).

21136519 is an equidigital number, since it uses as much as digits as its factorization.

21136519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1620, while the sum is 28.

The square root of 21136519 is about 4597.4470089388. The cubic root of 21136519 is about 276.4889768852.

The spelling of 21136519 in words is "twenty-one million, one hundred thirty-six thousand, five hundred nineteen".