21379270571 has 4 divisors (see below), whose sum is σ = 21381102912. Its totient is φ = 21377438232.

The previous prime is 21379270541. The next prime is 21379270579. The reversal of 21379270571 is 17507297312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21379270571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21379270579) 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, 898556 + ... + 922041.

It is an arithmetic number, because the mean of its divisors is an integer number (5345275728).

Almost surely, 2^21379270571 is an apocalyptic number.

21379270571 is a deficient number, since it is larger than the sum of its proper divisors (1832341).

21379270571 is a wasteful number, since it uses less digits than its factorization.

21379270571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1832340.

The product of its (nonzero) digits is 185220, while the sum is 44.

The spelling of 21379270571 in words is "twenty-one billion, three hundred seventy-nine million, two hundred seventy thousand, five hundred seventy-one".