21015419 has 2 divisors, whose sum is σ = 21015420. Its totient is φ = 21015418.

The previous prime is 21015409. The next prime is 21015437. The reversal of 21015419 is 91451012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21015419 - 2⁴ = 21015403 is a prime.

It is a super-2 number, since 2×21015419² = 883295671491122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21015394 and 21015403.

It is not a weakly prime, because it can be changed into another prime (21015409) 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, 10507709 + 10507710.

It is an arithmetic number, because the mean of its divisors is an integer number (10507710).

Almost surely, 2^21015419 is an apocalyptic number.

21015419 is a deficient number, since it is larger than the sum of its proper divisors (1).

21015419 is an equidigital number, since it uses as much as digits as its factorization.

21015419 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 21015419 is about 4584.2577370824. The cubic root of 21015419 is about 275.9599246931.

The spelling of 21015419 in words is "twenty-one million, fifteen thousand, four hundred nineteen".