21354110342 has 4 divisors (see below), whose sum is σ = 32031165516. Its totient is φ = 10677055170.

The previous prime is 21354110311. The next prime is 21354110359. The reversal of 21354110342 is 24301145312.

It is a happy number.

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

It is a super-2 number, since 2×21354110342² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5338527584 + ... + 5338527587.

It is an arithmetic number, because the mean of its divisors is an integer number (8007791379).

Almost surely, 2^21354110342 is an apocalyptic number.

21354110342 is a deficient number, since it is larger than the sum of its proper divisors (10677055174).

21354110342 is a wasteful number, since it uses less digits than its factorization.

21354110342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10677055173.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 21354110342 its reverse (24301145312), we get a palindrome (45655255654).

The spelling of 21354110342 in words is "twenty-one billion, three hundred fifty-four million, one hundred ten thousand, three hundred forty-two".