21775549355 has 32 divisors (see below), whose sum is σ = 31465190400. Its totient is φ = 14132506752.

The previous prime is 21775549351. The next prime is 21775549361. The reversal of 21775549355 is 55394557712.

It is not a de Polignac number, because 21775549355 - 2² = 21775549351 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21775549297 and 21775549306.

It is not an unprimeable number, because it can be changed into a prime (21775549351) 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 31 ways as a sum of consecutive naturals, for example, 711866 + ... + 741824.

It is an arithmetic number, because the mean of its divisors is an integer number (983287200).

Almost surely, 2^21775549355 is an apocalyptic number.

21775549355 is a deficient number, since it is larger than the sum of its proper divisors (9689641045).

21775549355 is a wasteful number, since it uses less digits than its factorization.

21775549355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31083.

The product of its digits is 6615000, while the sum is 53.

The spelling of 21775549355 in words is "twenty-one billion, seven hundred seventy-five million, five hundred forty-nine thousand, three hundred fifty-five".