21356322070647 has 8 divisors (see below), whose sum is σ = 28544717357680. Its totient is φ = 14202737415360.

The previous prime is 21356322070631. The next prime is 21356322070651. The reversal of 21356322070647 is 74607022365312.

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

It is not a de Polignac number, because 21356322070647 - 2⁴ = 21356322070631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21356322070596 and 21356322070605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21356322070697) 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, 8702656504 + ... + 8702658957.

It is an arithmetic number, because the mean of its divisors is an integer number (3568089669710).

Almost surely, 2^{21356322070647} is an apocalyptic number.

21356322070647 is a deficient number, since it is larger than the sum of its proper divisors (7188395287033).

21356322070647 is a wasteful number, since it uses less digits than its factorization.

21356322070647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17405315873.

The product of its (nonzero) digits is 2540160, while the sum is 48.

The spelling of 21356322070647 in words is "twenty-one trillion, three hundred fifty-six billion, three hundred twenty-two million, seventy thousand, six hundred forty-seven".