21415716615 has 16 divisors (see below), whose sum is σ = 34994193408. Its totient is φ = 11178699936.

The previous prime is 21415716571. The next prime is 21415716649. The reversal of 21415716615 is 51661751412.

It is not a de Polignac number, because 21415716615 - 2¹² = 21415712519 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15187747 + ... + 15189156.

It is an arithmetic number, because the mean of its divisors is an integer number (2187137088).

Almost surely, 2^21415716615 is an apocalyptic number.

21415716615 is a deficient number, since it is larger than the sum of its proper divisors (13578476793).

21415716615 is a wasteful number, since it uses less digits than its factorization.

21415716615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30376958.

The product of its digits is 50400, while the sum is 39.

The spelling of 21415716615 in words is "twenty-one billion, four hundred fifteen million, seven hundred sixteen thousand, six hundred fifteen".