21113242342 has 16 divisors (see below), whose sum is σ = 31821266880. Its totient is φ = 10506197952.

The previous prime is 21113242333. The next prime is 21113242351. The reversal of 21113242342 is 24324231112.

It is an interprime number because it is at equal distance from previous prime (21113242333) and next prime (21113242351).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1058659 + ... + 1078417.

It is an arithmetic number, because the mean of its divisors is an integer number (1988829180).

Almost surely, 2^21113242342 is an apocalyptic number.

21113242342 is a deficient number, since it is larger than the sum of its proper divisors (10708024538).

21113242342 is a wasteful number, since it uses less digits than its factorization.

21113242342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22287.

The product of its digits is 2304, while the sum is 25.

Adding to 21113242342 its reverse (24324231112), we get a palindrome (45437473454).

The spelling of 21113242342 in words is "twenty-one billion, one hundred thirteen million, two hundred forty-two thousand, three hundred forty-two".