21008943327 has 16 divisors (see below), whose sum is σ = 28791059040. Its totient is φ = 13621555200.

The previous prime is 21008943313. The next prime is 21008943341. The reversal of 21008943327 is 72334980012.

It is an interprime number because it is at equal distance from previous prime (21008943313) and next prime (21008943341).

It is not a de Polignac number, because 21008943327 - 2²⁰ = 21007894751 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21008943227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 628674 + ... + 661247.

It is an arithmetic number, because the mean of its divisors is an integer number (1799441190).

Almost surely, 2^21008943327 is an apocalyptic number.

21008943327 is a deficient number, since it is larger than the sum of its proper divisors (7782115713).

21008943327 is a wasteful number, since it uses less digits than its factorization.

21008943327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290074.

The product of its (nonzero) digits is 72576, while the sum is 39.

The spelling of 21008943327 in words is "twenty-one billion, eight million, nine hundred forty-three thousand, three hundred twenty-seven".