21132719 has 2 divisors, whose sum is σ = 21132720. Its totient is φ = 21132718.

The previous prime is 21132691. The next prime is 21132721. The reversal of 21132719 is 91723112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21132719 - 2²⁰ = 20084143 is a prime.

It is a super-2 number, since 2×21132719² = 893183624665922, which contains 22 as substring.

Together with 21132721, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21132739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566359 + 10566360.

It is an arithmetic number, because the mean of its divisors is an integer number (10566360).

Almost surely, 2^21132719 is an apocalyptic number.

21132719 is a deficient number, since it is larger than the sum of its proper divisors (1).

21132719 is an equidigital number, since it uses as much as digits as its factorization.

21132719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 756, while the sum is 26.

The square root of 21132719 is about 4597.0337175183. The cubic root of 21132719 is about 276.4724064953.

The spelling of 21132719 in words is "twenty-one million, one hundred thirty-two thousand, seven hundred nineteen".