21560611071 has 4 divisors (see below), whose sum is σ = 28747481432. Its totient is φ = 14373740712.

The previous prime is 21560611067. The next prime is 21560611139. The reversal of 21560611071 is 17011606512.

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

It is not a de Polignac number, because 21560611071 - 2² = 21560611067 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 (21560611571) 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, 3593435176 + ... + 3593435181.

It is an arithmetic number, because the mean of its divisors is an integer number (7186870358).

Almost surely, 2^21560611071 is an apocalyptic number.

21560611071 is a deficient number, since it is larger than the sum of its proper divisors (7186870361).

21560611071 is an equidigital number, since it uses as much as digits as its factorization.

21560611071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7186870360.

The product of its (nonzero) digits is 2520, while the sum is 30.

The spelling of 21560611071 in words is "twenty-one billion, five hundred sixty million, six hundred eleven thousand, seventy-one".