21650112015 has 16 divisors (see below), whose sum is σ = 39588776448. Its totient is φ = 9897194016.

The previous prime is 21650111981. The next prime is 21650112047. The reversal of 21650112015 is 51021105612.

It is not a de Polignac number, because 21650112015 - 2¹⁰ = 21650110991 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, 103095667 + ... + 103095876.

It is an arithmetic number, because the mean of its divisors is an integer number (2474298528).

Almost surely, 2^21650112015 is an apocalyptic number.

21650112015 is a deficient number, since it is larger than the sum of its proper divisors (17938664433).

21650112015 is a wasteful number, since it uses less digits than its factorization.

21650112015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206191558.

The product of its (nonzero) digits is 600, while the sum is 24.

Adding to 21650112015 its reverse (51021105612), we get a palindrome (72671217627).

The spelling of 21650112015 in words is "twenty-one billion, six hundred fifty million, one hundred twelve thousand, fifteen".