21415314505 has 8 divisors (see below), whose sum is σ = 27675175752. Its totient is φ = 15814386048.

The previous prime is 21415314497. The next prime is 21415314527. The reversal of 21415314505 is 50541351412.

It can be written as a sum of positive squares in 4 ways, for example, as 596287561 + 20819026944 = 24419^2 + 144288^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21415314505 - 2³ = 21415314497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164733124 + ... + 164733253.

It is an arithmetic number, because the mean of its divisors is an integer number (3459396969).

Almost surely, 2^21415314505 is an apocalyptic number.

It is an amenable number.

21415314505 is a deficient number, since it is larger than the sum of its proper divisors (6259861247).

21415314505 is a wasteful number, since it uses less digits than its factorization.

21415314505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329466395.

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 21415314505 its reverse (50541351412), we get a palindrome (71956665917).

The spelling of 21415314505 in words is "twenty-one billion, four hundred fifteen million, three hundred fourteen thousand, five hundred five".