21243034311 has 8 divisors (see below), whose sum is σ = 28804114560. Its totient is φ = 13921988472.

The previous prime is 21243034273. The next prime is 21243034313. The reversal of 21243034311 is 11343034212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21243034311 - 2²⁹ = 20706163399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21243034313) 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, 60008395 + ... + 60008748.

It is an arithmetic number, because the mean of its divisors is an integer number (3600514320).

Almost surely, 2^21243034311 is an apocalyptic number.

21243034311 is a deficient number, since it is larger than the sum of its proper divisors (7561080249).

21243034311 is a wasteful number, since it uses less digits than its factorization.

21243034311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120017205.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21243034311 its reverse (11343034212), we get a palindrome (32586068523).

Subtracting from 21243034311 its reverse (11343034212), we obtain a palindrome (9900000099).

The spelling of 21243034311 in words is "twenty-one billion, two hundred forty-three million, thirty-four thousand, three hundred eleven".