21327267652 has 12 divisors (see below), whose sum is σ = 39518172540. Its totient is φ = 10036361216.

The previous prime is 21327267629. The next prime is 21327267659. The reversal of 21327267652 is 25676272312.

It can be written as a sum of positive squares in 2 ways, for example, as 7019758656 + 14307508996 = 83784^2 + 119614^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21327267599 and 21327267608.

It is not an unprimeable number, because it can be changed into a prime (21327267659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156818077 + ... + 156818212.

It is an arithmetic number, because the mean of its divisors is an integer number (3293181045).

Almost surely, 2^21327267652 is an apocalyptic number.

It is an amenable number.

21327267652 is a deficient number, since it is larger than the sum of its proper divisors (18190904888).

21327267652 is a wasteful number, since it uses less digits than its factorization.

21327267652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313636310 (or 313636308 counting only the distinct ones).

The product of its digits is 423360, while the sum is 43.

The spelling of 21327267652 in words is "twenty-one billion, three hundred twenty-seven million, two hundred sixty-seven thousand, six hundred fifty-two".