21231246 has 16 divisors (see below), whose sum is σ = 44697600. Its totient is φ = 6704568.

The previous prime is 21231241. The next prime is 21231253. The reversal of 21231246 is 64213212.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231241) 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, 93006 + ... + 93233.

It is an arithmetic number, because the mean of its divisors is an integer number (2793600).

Almost surely, 2^21231246 is an apocalyptic number.

21231246 is an abundant number, since it is smaller than the sum of its proper divisors (23466354).

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

21231246 is a wasteful number, since it uses less digits than its factorization.

21231246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186263.

The product of its digits is 576, while the sum is 21.

The square root of 21231246 is about 4607.7376227385. The cubic root of 21231246 is about 276.9014059134.

Adding to 21231246 its reverse (64213212), we get a palindrome (85444458).

The spelling of 21231246 in words is "twenty-one million, two hundred thirty-one thousand, two hundred forty-six".