21966906615 has 16 divisors (see below), whose sum is σ = 35152137216. Its totient is φ = 11713988000.

The previous prime is 21966906613. The next prime is 21966906629. The reversal of 21966906615 is 51660966912.

It is not a de Polignac number, because 21966906615 - 2¹ = 21966906613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21966906613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4870 + ... + 209660.

It is an arithmetic number, because the mean of its divisors is an integer number (2197008576).

Almost surely, 2^21966906615 is an apocalyptic number.

21966906615 is a deficient number, since it is larger than the sum of its proper divisors (13185230601).

21966906615 is a wasteful number, since it uses less digits than its factorization.

21966906615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211950.

The product of its (nonzero) digits is 1049760, while the sum is 51.

The spelling of 21966906615 in words is "twenty-one billion, nine hundred sixty-six million, nine hundred six thousand, six hundred fifteen".