21279471759 has 24 divisors (see below), whose sum is σ = 37830173472. Its totient is φ = 11224336320.

The previous prime is 21279471713. The next prime is 21279471769. The reversal of 21279471759 is 95717497212.

It is not a de Polignac number, because 21279471759 - 2¹⁵ = 21279438991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21279471769) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12990312 + ... + 12991949.

It is an arithmetic number, because the mean of its divisors is an integer number (1576257228).

Almost surely, 2^21279471759 is an apocalyptic number.

21279471759 is a deficient number, since it is larger than the sum of its proper divisors (16550701713).

21279471759 is a wasteful number, since it uses less digits than its factorization.

21279471759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25982287 (or 25982284 counting only the distinct ones).

The product of its digits is 2222640, while the sum is 54.

The spelling of 21279471759 in words is "twenty-one billion, two hundred seventy-nine million, four hundred seventy-one thousand, seven hundred fifty-nine".