21606264527 has 4 divisors (see below), whose sum is σ = 21771197976. Its totient is φ = 21441331080.

The previous prime is 21606264521. The next prime is 21606264593. The reversal of 21606264527 is 72546260612.

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 21606264527 - 2¹⁴ = 21606248143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21606264521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82466528 + ... + 82466789.

It is an arithmetic number, because the mean of its divisors is an integer number (5442799494).

Almost surely, 2^21606264527 is an apocalyptic number.

21606264527 is a deficient number, since it is larger than the sum of its proper divisors (164933449).

21606264527 is a wasteful number, since it uses less digits than its factorization.

21606264527 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164933448.

The product of its (nonzero) digits is 241920, while the sum is 41.

The spelling of 21606264527 in words is "twenty-one billion, six hundred six million, two hundred sixty-four thousand, five hundred twenty-seven".