21550040738 has 16 divisors (see below), whose sum is σ = 32513438400. Its totient is φ = 10712314800.

The previous prime is 21550040713. The next prime is 21550040741. The reversal of 21550040738 is 83704005512.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21550040698 and 21550040707.

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, 492848 + ... + 534788.

It is an arithmetic number, because the mean of its divisors is an integer number (2032089900).

Almost surely, 2^21550040738 is an apocalyptic number.

21550040738 is a deficient number, since it is larger than the sum of its proper divisors (10963397662).

21550040738 is a wasteful number, since it uses less digits than its factorization.

21550040738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43433.

The product of its (nonzero) digits is 33600, while the sum is 35.

The spelling of 21550040738 in words is "twenty-one billion, five hundred fifty million, forty thousand, seven hundred thirty-eight".