21113242311 has 16 divisors (see below), whose sum is σ = 33571367424. Its totient is φ = 11540157024.

The previous prime is 21113242309. The next prime is 21113242313. The reversal of 21113242311 is 11324231112.

It is an interprime number because it is at equal distance from previous prime (21113242309) and next prime (21113242313).

It is not a de Polignac number, because 21113242311 - 2¹ = 21113242309 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113242313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21855876 + ... + 21856841.

It is an arithmetic number, because the mean of its divisors is an integer number (2098210464).

Almost surely, 2^21113242311 is an apocalyptic number.

21113242311 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21113242311 is a deficient number, since it is larger than the sum of its proper divisors (12458125113).

21113242311 is a wasteful number, since it uses less digits than its factorization.

21113242311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43712750.

The product of its digits is 288, while the sum is 21.

Adding to 21113242311 its reverse (11324231112), we get a palindrome (32437473423).

The spelling of 21113242311 in words is "twenty-one billion, one hundred thirteen million, two hundred forty-two thousand, three hundred eleven".