21654262216 has 16 divisors (see below), whose sum is σ = 40638769740. Its totient is φ = 10817256960.

The previous prime is 21654262163. The next prime is 21654262229. The reversal of 21654262216 is 61226245612.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21600180900 + 54081316 = 146970^2 + 7354^2 .

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, 1224945 + ... + 1242496.

Almost surely, 2^21654262216 is an apocalyptic number.

It is an amenable number.

21654262216 is a deficient number, since it is larger than the sum of its proper divisors (18984507524).

21654262216 is a wasteful number, since it uses less digits than its factorization.

21654262216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2468544 (or 2468540 counting only the distinct ones).

The product of its digits is 69120, while the sum is 37.

The spelling of 21654262216 in words is "twenty-one billion, six hundred fifty-four million, two hundred sixty-two thousand, two hundred sixteen".