21419586 has 32 divisors (see below), whose sum is σ = 48211200. Its totient is φ = 7048080.

The previous prime is 21419557. The next prime is 21419591. The reversal of 21419586 is 68591412.

It is a super-2 number, since 2×21419586² = 917597328822792, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21419586.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1756 + ... + 6776.

It is an arithmetic number, because the mean of its divisors is an integer number (1506600).

Almost surely, 2^21419586 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21419586, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24105600).

21419586 is an abundant number, since it is smaller than the sum of its proper divisors (26791614).

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

21419586 is a wasteful number, since it uses less digits than its factorization.

21419586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5111 (or 5105 counting only the distinct ones).

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

The square root of 21419586 is about 4628.1298598894. The cubic root of 21419586 is about 277.7177837487.

The spelling of 21419586 in words is "twenty-one million, four hundred nineteen thousand, five hundred eighty-six".