21775355107 has 16 divisors (see below), whose sum is σ = 24435194112. Its totient is φ = 19230570720.

The previous prime is 21775355059. The next prime is 21775355111. The reversal of 21775355107 is 70155357712.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21775355107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21775355197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 220098 + ... + 303304.

It is an arithmetic number, because the mean of its divisors is an integer number (1527199632).

Almost surely, 2^21775355107 is an apocalyptic number.

21775355107 is a deficient number, since it is larger than the sum of its proper divisors (2659839005).

21775355107 is a wasteful number, since it uses less digits than its factorization.

21775355107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83898.

The product of its (nonzero) digits is 257250, while the sum is 43.

The spelling of 21775355107 in words is "twenty-one billion, seven hundred seventy-five million, three hundred fifty-five thousand, one hundred seven".