21115344134 has 8 divisors (see below), whose sum is σ = 31688647848. Its totient is φ = 10552461520.

The previous prime is 21115344109. The next prime is 21115344169. The reversal of 21115344134 is 43144351112.

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

It is a junction number, because it is equal to n+sod(n) for n = 21115344097 and 21115344106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2600207 + ... + 2608314.

It is an arithmetic number, because the mean of its divisors is an integer number (3961080981).

Almost surely, 2^21115344134 is an apocalyptic number.

21115344134 is a deficient number, since it is larger than the sum of its proper divisors (10573303714).

21115344134 is a wasteful number, since it uses less digits than its factorization.

21115344134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5210550.

The product of its digits is 5760, while the sum is 29.

Adding to 21115344134 its reverse (43144351112), we get a palindrome (64259695246).

The spelling of 21115344134 in words is "twenty-one billion, one hundred fifteen million, three hundred forty-four thousand, one hundred thirty-four".