21110771527 has 4 divisors (see below), whose sum is σ = 21304448440. Its totient is φ = 20917094616.

The previous prime is 21110771519. The next prime is 21110771537. The reversal of 21110771527 is 72517701112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21110771527 - 2³ = 21110771519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110771492 and 21110771501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110771537) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 96838293 + ... + 96838510.

It is an arithmetic number, because the mean of its divisors is an integer number (5326112110).

Almost surely, 2^21110771527 is an apocalyptic number.

21110771527 is a deficient number, since it is larger than the sum of its proper divisors (193676913).

21110771527 is a wasteful number, since it uses less digits than its factorization.

21110771527 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193676912.

The product of its (nonzero) digits is 6860, while the sum is 34.

The spelling of 21110771527 in words is "twenty-one billion, one hundred ten million, seven hundred seventy-one thousand, five hundred twenty-seven".