21111043342 has 4 divisors (see below), whose sum is σ = 31666565016. Its totient is φ = 10555521670.

The previous prime is 21111043313. The next prime is 21111043351. The reversal of 21111043342 is 24334011112.

It is a semiprime because it is the product of two primes.

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 as a sum of consecutive naturals, namely, 5277760834 + ... + 5277760837.

It is an arithmetic number, because the mean of its divisors is an integer number (7916641254).

Almost surely, 2^21111043342 is an apocalyptic number.

21111043342 is a deficient number, since it is larger than the sum of its proper divisors (10555521674).

21111043342 is a wasteful number, since it uses less digits than its factorization.

21111043342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10555521673.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21111043342 its reverse (24334011112), we get a palindrome (45445054454).

It can be divided in two parts, 211110 and 43342, that added together give a palindrome (254452).

The spelling of 21111043342 in words is "twenty-one billion, one hundred eleven million, forty-three thousand, three hundred forty-two".