21536271067 has 8 divisors (see below), whose sum is σ = 21674325600. Its totient is φ = 21398650944.

The previous prime is 21536271049. The next prime is 21536271079. The reversal of 21536271067 is 76017263512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21536271067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21536271017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8842 + ... + 207727.

It is an arithmetic number, because the mean of its divisors is an integer number (2709290700).

Almost surely, 2^21536271067 is an apocalyptic number.

21536271067 is a deficient number, since it is larger than the sum of its proper divisors (138054533).

21536271067 is a wasteful number, since it uses less digits than its factorization.

21536271067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217205.

The product of its (nonzero) digits is 105840, while the sum is 40.

The spelling of 21536271067 in words is "twenty-one billion, five hundred thirty-six million, two hundred seventy-one thousand, sixty-seven".