21670447359 has 32 divisors (see below), whose sum is σ = 34249973760. Its totient is φ = 12040984800.

The previous prime is 21670447343. The next prime is 21670447363. The reversal of 21670447359 is 95374407612.

It is not a de Polignac number, because 21670447359 - 2⁴ = 21670447343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21670447319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 538017 + ... + 576890.

It is an arithmetic number, because the mean of its divisors is an integer number (1070311680).

Almost surely, 2^21670447359 is an apocalyptic number.

21670447359 is a deficient number, since it is larger than the sum of its proper divisors (12579526401).

21670447359 is a wasteful number, since it uses less digits than its factorization.

21670447359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1114971.

The product of its (nonzero) digits is 1270080, while the sum is 48.

The spelling of 21670447359 in words is "twenty-one billion, six hundred seventy million, four hundred forty-seven thousand, three hundred fifty-nine".