21319019 has 8 divisors (see below), whose sum is σ = 21673920. Its totient is φ = 20966400.

The previous prime is 21318991. The next prime is 21319027. The reversal of 21319019 is 91091312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21319019 - 2⁸ = 21318763 is a prime.

It is a super-2 number, since 2×21319019² = 909001142244722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21319219) 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 in 7 ways as a sum of consecutive naturals, for example, 32939 + ... + 33579.

It is an arithmetic number, because the mean of its divisors is an integer number (2709240).

Almost surely, 2^21319019 is an apocalyptic number.

21319019 is a deficient number, since it is larger than the sum of its proper divisors (354901).

21319019 is an equidigital number, since it uses as much as digits as its factorization.

21319019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1141.

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 21319019 is about 4617.2523214570. The cubic root of 21319019 is about 277.2824645836.

The spelling of 21319019 in words is "twenty-one million, three hundred nineteen thousand, nineteen".