21519486 has 16 divisors (see below), whose sum is σ = 47821200. Its totient is φ = 7173144.

The previous prime is 21519469. The next prime is 21519497. The reversal of 21519486 is 68491512.

It is a plaindrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 21519486.

It is a congruent number.

It is an unprimeable number.

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, 199201 + ... + 199308.

It is an arithmetic number, because the mean of its divisors is an integer number (2988825).

Almost surely, 2^21519486 is an apocalyptic number.

21519486 is an abundant number, since it is smaller than the sum of its proper divisors (26301714).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21519486 is a wasteful number, since it uses less digits than its factorization.

21519486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398520 (or 398514 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 21519486 is about 4638.9100012826. The cubic root of 21519486 is about 278.1488687338.

It can be divided in two parts, 215 and 19486, that added together give a triangular number (19701 = T₁₉₈).

The spelling of 21519486 in words is "twenty-one million, five hundred nineteen thousand, four hundred eighty-six".