21201321404 has 12 divisors (see below), whose sum is σ = 37105112184. Its totient is φ = 10599860784.

The previous prime is 21201321397. The next prime is 21201321439. The reversal of 21201321404 is 40412310212.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 138227 + ... + 248010.

It is an arithmetic number, because the mean of its divisors is an integer number (3092092682).

Almost surely, 2^21201321404 is an apocalyptic number.

It is an amenable number.

21201321404 is a deficient number, since it is larger than the sum of its proper divisors (15903790780).

21201321404 is a wasteful number, since it uses less digits than its factorization.

21201321404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399964 (or 399962 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21201321404 its reverse (40412310212), we get a palindrome (61613631616).

The spelling of 21201321404 in words is "twenty-one billion, two hundred one million, three hundred twenty-one thousand, four hundred four".