21036006321 has 8 divisors (see below), whose sum is σ = 30597827424. Its totient is φ = 12749094720.

The previous prime is 21036006317. The next prime is 21036006359. The reversal of 21036006321 is 12360063012.

It is a happy number.

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

It is not a de Polignac number, because 21036006321 - 2² = 21036006317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21036006291 and 21036006300.

It is not an unprimeable number, because it can be changed into a prime (21036006301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318727336 + ... + 318727401.

It is an arithmetic number, because the mean of its divisors is an integer number (3824728428).

Almost surely, 2^21036006321 is an apocalyptic number.

It is an amenable number.

21036006321 is a deficient number, since it is larger than the sum of its proper divisors (9561821103).

21036006321 is a wasteful number, since it uses less digits than its factorization.

21036006321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637454751.

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 21036006321 its reverse (12360063012), we get a palindrome (33396069333).

The spelling of 21036006321 in words is "twenty-one billion, thirty-six million, six thousand, three hundred twenty-one".