21243032246 has 24 divisors (see below), whose sum is σ = 32451225384. Its totient is φ = 10429434720.

The previous prime is 21243032233. The next prime is 21243032249. The reversal of 21243032246 is 64223034212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21243032249) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10657826 + ... + 10659818.

It is an arithmetic number, because the mean of its divisors is an integer number (1352134391).

Almost surely, 2^21243032246 is an apocalyptic number.

21243032246 is a deficient number, since it is larger than the sum of its proper divisors (11208193138).

21243032246 is a wasteful number, since it uses less digits than its factorization.

21243032246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3644 (or 3585 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 21243032246 its reverse (64223034212), we get a palindrome (85466066458).

The spelling of 21243032246 in words is "twenty-one billion, two hundred forty-three million, thirty-two thousand, two hundred forty-six".