21003419 has 4 divisors (see below), whose sum is σ = 21028896. Its totient is φ = 20977944.

The previous prime is 21003413. The next prime is 21003427. The reversal of 21003419 is 91430012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21003419 - 2²⁰ = 19954843 is a prime.

It is a super-2 number, since 2×21003419² = 882287219379122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21003419.

It is not an unprimeable number, because it can be changed into a prime (21003413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11459 + ... + 13164.

It is an arithmetic number, because the mean of its divisors is an integer number (5257224).

Almost surely, 2^21003419 is an apocalyptic number.

21003419 is a deficient number, since it is larger than the sum of its proper divisors (25477).

21003419 is an equidigital number, since it uses as much as digits as its factorization.

21003419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25476.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 21003419 is about 4582.9487232567. The cubic root of 21003419 is about 275.9073894633.

The spelling of 21003419 in words is "twenty-one million, three thousand, four hundred nineteen".