21519489 has 8 divisors (see below), whose sum is σ = 28771072. Its totient is φ = 14307120.

The previous prime is 21519469. The next prime is 21519497. The reversal of 21519489 is 98491512.

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

It is not a de Polignac number, because 21519489 - 2¹⁷ = 21388417 is a prime.

It is a super-2 number, since 2×21519489² = 926176813642242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21519409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8497 + ... + 10734.

It is an arithmetic number, because the mean of its divisors is an integer number (3596384).

Almost surely, 2^21519489 is an apocalyptic number.

It is an amenable number.

21519489 is a deficient number, since it is larger than the sum of its proper divisors (7251583).

21519489 is a wasteful number, since it uses less digits than its factorization.

21519489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19607.

The product of its digits is 25920, while the sum is 39.

The square root of 21519489 is about 4638.9103246344. The cubic root of 21519489 is about 278.1488816593.

The spelling of 21519489 in words is "twenty-one million, five hundred nineteen thousand, four hundred eighty-nine".