21086647329 has 8 divisors (see below), whose sum is σ = 30671487072. Its totient is φ = 12779786240.

The previous prime is 21086647303. The next prime is 21086647367. The reversal of 21086647329 is 92374668012.

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

It is a cyclic number.

It is not a de Polignac number, because 21086647329 - 2⁹ = 21086646817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21086647369) 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, 319494624 + ... + 319494689.

It is an arithmetic number, because the mean of its divisors is an integer number (3833935884).

Almost surely, 2^21086647329 is an apocalyptic number.

It is an amenable number.

21086647329 is a deficient number, since it is larger than the sum of its proper divisors (9584839743).

21086647329 is a wasteful number, since it uses less digits than its factorization.

21086647329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638989327.

The product of its (nonzero) digits is 870912, while the sum is 48.

The spelling of 21086647329 in words is "twenty-one billion, eighty-six million, six hundred forty-seven thousand, three hundred twenty-nine".