21234486 has 32 divisors (see below), whose sum is σ = 52270848. Its totient is φ = 5600160.

The previous prime is 21234469. The next prime is 21234487. The reversal of 21234486 is 68443212.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234487) 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, 18900 + ... + 19991.

It is an arithmetic number, because the mean of its divisors is an integer number (1633464).

Almost surely, 2^21234486 is an apocalyptic number.

21234486 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21234486 is an abundant number, since it is smaller than the sum of its proper divisors (31036362).

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

21234486 is a wasteful number, since it uses less digits than its factorization.

21234486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38916.

The product of its digits is 9216, while the sum is 30.

The square root of 21234486 is about 4608.0891918451. The cubic root of 21234486 is about 276.9154907347.

Adding to 21234486 its reverse (68443212), we get a palindrome (89677698).

The spelling of 21234486 in words is "twenty-one million, two hundred thirty-four thousand, four hundred eighty-six".