21734519 has 2 divisors, whose sum is σ = 21734520. Its totient is φ = 21734518.

The previous prime is 21734501. The next prime is 21734527. The reversal of 21734519 is 91543712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21734519 - 2⁸ = 21734263 is a prime.

It is a super-2 number, since 2×21734519² = 944778632322722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21734719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10867259 + 10867260.

It is an arithmetic number, because the mean of its divisors is an integer number (10867260).

Almost surely, 2^21734519 is an apocalyptic number.

21734519 is a deficient number, since it is larger than the sum of its proper divisors (1).

21734519 is an equidigital number, since it uses as much as digits as its factorization.

21734519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 32.

The square root of 21734519 is about 4662.0294936862. The cubic root of 21734519 is about 279.0722653810.

The spelling of 21734519 in words is "twenty-one million, seven hundred thirty-four thousand, five hundred nineteen".