21221113424342 has 32 divisors (see below), whose sum is σ = 34668309795840. Its totient is φ = 9683506990080.

The previous prime is 21221113424333. The next prime is 21221113424351. The reversal of 21221113424342 is 24342431112212.

It is an interprime number because it is at equal distance from previous prime (21221113424333) and next prime (21221113424351).

It is a junction number, because it is equal to n+sod(n) for n = 21221113424299 and 21221113424308.

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, 27951083 + ... + 28700265.

It is an arithmetic number, because the mean of its divisors is an integer number (1083384681120).

Almost surely, 2^{21221113424342} is an apocalyptic number.

21221113424342 is a deficient number, since it is larger than the sum of its proper divisors (13447196371498).

21221113424342 is a wasteful number, since it uses less digits than its factorization.

21221113424342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761528.

The product of its digits is 18432, while the sum is 32.

Adding to 21221113424342 its reverse (24342431112212), we get a palindrome (45563544536554).

The spelling of 21221113424342 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred thirteen million, four hundred twenty-four thousand, three hundred forty-two".