21112777000 has 96 divisors (see below), whose sum is σ = 57469974120. Its totient is φ = 7238649600.

The previous prime is 21112776977. The next prime is 21112777019. The reversal of 21112777000 is 77721112.

It can be written as a sum of positive squares in 4 ways, for example, as 10078955236 + 11033821764 = 100394^2 + 105042^2 .

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 21112777000.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 166437 + ... + 264436.

Almost surely, 2^21112777000 is an apocalyptic number.

21112777000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112777000 is an abundant number, since it is smaller than the sum of its proper divisors (36357197120).

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

21112777000 is a wasteful number, since it uses less digits than its factorization.

21112777000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430908 (or 430887 counting only the distinct ones).

The product of its (nonzero) digits is 1372, while the sum is 28.

The spelling of 21112777000 in words is "twenty-one billion, one hundred twelve million, seven hundred seventy-seven thousand".