21111123342 has 8 divisors (see below), whose sum is σ = 42222246696. Its totient is φ = 7037041112.

The previous prime is 21111123281. The next prime is 21111123377. The reversal of 21111123342 is 24332111112.

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

21111123342 is an admirable number.

It is a super-2 number, since 2×21111123342² (a number of 21 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 1759260273 + ... + 1759260284.

It is an arithmetic number, because the mean of its divisors is an integer number (5277780837).

Almost surely, 2^21111123342 is an apocalyptic number.

21111123342 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21111123342 is a wasteful number, since it uses less digits than its factorization.

21111123342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3518520562.

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

Adding to 21111123342 its reverse (24332111112), we get a palindrome (45443234454).

It can be divided in two parts, 21111 and 123342, that added together give a triangular number (144453 = T₅₃₇).

The spelling of 21111123342 in words is "twenty-one billion, one hundred eleven million, one hundred twenty-three thousand, three hundred forty-two".