21835019 has 2 divisors, whose sum is σ = 21835020. Its totient is φ = 21835018.

The previous prime is 21835007. The next prime is 21835039. The reversal of 21835019 is 91053812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21835019 - 2²⁰ = 20786443 is a prime.

It is a super-2 number, since 2×21835019² = 953536109460722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21834982 and 21835000.

It is not a weakly prime, because it can be changed into another prime (21835039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10917509 + 10917510.

It is an arithmetic number, because the mean of its divisors is an integer number (10917510).

Almost surely, 2^21835019 is an apocalyptic number.

21835019 is a deficient number, since it is larger than the sum of its proper divisors (1).

21835019 is an equidigital number, since it uses as much as digits as its factorization.

21835019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 21835019 is about 4672.7956300271. The cubic root of 21835019 is about 279.5017456952.

The spelling of 21835019 in words is "twenty-one million, eight hundred thirty-five thousand, nineteen".