21827261000 has 32 divisors (see below), whose sum is σ = 51075793080. Its totient is φ = 8730904000.

The previous prime is 21827260991. The next prime is 21827261033. The reversal of 21827261000 is 16272812.

It can be written as a sum of positive squares in 4 ways, for example, as 10160236804 + 11667024196 = 100798^2 + 108014^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10912631 + ... + 10914630.

Almost surely, 2^21827261000 is an apocalyptic number.

21827261000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21827261000 is an abundant number, since it is smaller than the sum of its proper divisors (29248532080).

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

21827261000 is a wasteful number, since it uses less digits than its factorization.

21827261000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21827282 (or 21827268 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The spelling of 21827261000 in words is "twenty-one billion, eight hundred twenty-seven million, two hundred sixty-one thousand".