21327689204 has 12 divisors (see below), whose sum is σ = 37349955300. Its totient is φ = 10656273408.

The previous prime is 21327689191. The next prime is 21327689209. The reversal of 21327689204 is 40298672312.

It can be written as a sum of positive squares in 2 ways, for example, as 8125219600 + 13202469604 = 90140^2 + 114902^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21327689209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1886459 + ... + 1897730.

It is an arithmetic number, because the mean of its divisors is an integer number (3112496275).

Almost surely, 2^21327689204 is an apocalyptic number.

It is an amenable number.

21327689204 is a deficient number, since it is larger than the sum of its proper divisors (16022266096).

21327689204 is a wasteful number, since it uses less digits than its factorization.

21327689204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3785602 (or 3785600 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 44.

The spelling of 21327689204 in words is "twenty-one billion, three hundred twenty-seven million, six hundred eighty-nine thousand, two hundred four".