21665030126 has 8 divisors (see below), whose sum is σ = 32505238704. Its totient is φ = 10829950560.

The previous prime is 21665030083. The next prime is 21665030131. The reversal of 21665030126 is 62103056612.

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 = 21665030092 and 21665030101.

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, 1271675 + ... + 1288598.

It is an arithmetic number, because the mean of its divisors is an integer number (4063154838).

Almost surely, 2^21665030126 is an apocalyptic number.

21665030126 is a deficient number, since it is larger than the sum of its proper divisors (10840208578).

21665030126 is a wasteful number, since it uses less digits than its factorization.

21665030126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2564506.

The product of its (nonzero) digits is 12960, while the sum is 32.

Adding to 21665030126 its reverse (62103056612), we get a palindrome (83768086738).

The spelling of 21665030126 in words is "twenty-one billion, six hundred sixty-five million, thirty thousand, one hundred twenty-six".