21111212341342 has 32 divisors (see below), whose sum is σ = 33590884187520. Its totient is φ = 9922844000160.

The previous prime is 21111212341313. The next prime is 21111212341357. The reversal of 21111212341342 is 24314321211112.

It is a self number, because there is not a number n which added to its sum of digits gives 21111212341342.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58625613 + ... + 58984615.

It is an arithmetic number, because the mean of its divisors is an integer number (1049715130860).

Almost surely, 2^{21111212341342} is an apocalyptic number.

21111212341342 is a deficient number, since it is larger than the sum of its proper divisors (12479671846178).

21111212341342 is a wasteful number, since it uses less digits than its factorization.

21111212341342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370968.

The product of its digits is 2304, while the sum is 28.

Adding to 21111212341342 its reverse (24314321211112), we get a palindrome (45425533552454).

The spelling of 21111212341342 in words is "twenty-one trillion, one hundred eleven billion, two hundred twelve million, three hundred forty-one thousand, three hundred forty-two".