21775770036 has 18 divisors (see below), whose sum is σ = 55044307682. Its totient is φ = 7258590000.

The previous prime is 21775770011. The next prime is 21775770043. The reversal of 21775770036 is 63007757712.

21775770036 is a `hidden beast` number, since 2 + 1 + 77 + 577 + 0 + 0 + 3 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21519129636 + 256640400 = 146694^2 + 16020^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 21775769973 and 21775770000.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 302441215 + ... + 302441286.

Almost surely, 2^21775770036 is an apocalyptic number.

It is an amenable number.

21775770036 is an abundant number, since it is smaller than the sum of its proper divisors (33268537646).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21775770036 is a wasteful number, since it uses less digits than its factorization.

21775770036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604882511 (or 604882506 counting only the distinct ones).

The product of its (nonzero) digits is 432180, while the sum is 45.

The spelling of 21775770036 in words is "twenty-one billion, seven hundred seventy-five million, seven hundred seventy thousand, thirty-six".