21506114416 has 20 divisors (see below), whose sum is σ = 42684393024. Its totient is φ = 10490787200.

The previous prime is 21506114389. The next prime is 21506114423. The reversal of 21506114416 is 61441160512.

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, 16391200 + ... + 16392511.

Almost surely, 2^21506114416 is an apocalyptic number.

It is an amenable number.

21506114416 is a deficient number, since it is larger than the sum of its proper divisors (21178278608).

21506114416 is a wasteful number, since it uses less digits than its factorization.

21506114416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32783760 (or 32783754 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

Adding to 21506114416 its reverse (61441160512), we get a palindrome (82947274928).

The spelling of 21506114416 in words is "twenty-one billion, five hundred six million, one hundred fourteen thousand, four hundred sixteen".