21143486 has 32 divisors (see below), whose sum is σ = 40739328. Its totient is φ = 7999200.

The previous prime is 21143483. The next prime is 21143489. The reversal of 21143486 is 68434112.

It is an interprime number because it is at equal distance from previous prime (21143483) and next prime (21143489).

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143483) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1661 + ... + 6711.

It is an arithmetic number, because the mean of its divisors is an integer number (1273104).

Almost surely, 2^21143486 is an apocalyptic number.

21143486 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21143486 is a deficient number, since it is larger than the sum of its proper divisors (19595842).

21143486 is a wasteful number, since it uses less digits than its factorization.

21143486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5096.

The product of its digits is 4608, while the sum is 29.

The square root of 21143486 is about 4598.2046496432. The cubic root of 21143486 is about 276.5193522290.

Adding to 21143486 its reverse (68434112), we get a palindrome (89577598).

The spelling of 21143486 in words is "twenty-one million, one hundred forty-three thousand, four hundred eighty-six".