21127785316 has 27 divisors (see below), whose sum is σ = 40646582067. Its totient is φ = 9602085240.

The previous prime is 21127785313. The next prime is 21127785331. The reversal of 21127785316 is 61358772112.

The square root of 21127785316 is 145354.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21127785313) 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 8 ways as a sum of consecutive naturals, for example, 3194485 + ... + 3201091.

Almost surely, 2^21127785316 is an apocalyptic number.

21127785316 is the 145354-th square number.

It is an amenable number.

21127785316 is a deficient number, since it is larger than the sum of its proper divisors (19518796751).

21127785316 is an frugal number, since it uses more digits than its factorization.

21127785316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13240 (or 6620 counting only the distinct ones).

The product of its digits is 141120, while the sum is 43.

The spelling of 21127785316 in words is "twenty-one billion, one hundred twenty-seven million, seven hundred eighty-five thousand, three hundred sixteen".