21243244311 has 12 divisors (see below), whose sum is σ = 30818683480. Its totient is φ = 14100318000.

The previous prime is 21243244303. The next prime is 21243244391. The reversal of 21243244311 is 11344234212.

21243244311 is a `hidden beast` number, since 2 + 1 + 24 + 324 + 4 + 311 = 666.

It is not a de Polignac number, because 21243244311 - 2³ = 21243244303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21243244301) 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, 5151565 + ... + 5155686.

Almost surely, 2^21243244311 is an apocalyptic number.

21243244311 is a deficient number, since it is larger than the sum of its proper divisors (9575439169).

21243244311 is a wasteful number, since it uses less digits than its factorization.

21243244311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10307486 (or 10307483 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 21243244311 its reverse (11344234212), we get a palindrome (32587478523).

The spelling of 21243244311 in words is "twenty-one billion, two hundred forty-three million, two hundred forty-four thousand, three hundred eleven".