21233220404 has 24 divisors (see below), whose sum is σ = 42669631200. Its totient is φ = 9143491680.

The previous prime is 21233220403. The next prime is 21233220419. The reversal of 21233220404 is 40402233212.

It is a self number, because there is not a number n which added to its sum of digits gives 21233220404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233220401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12698459 + ... + 12700130.

It is an arithmetic number, because the mean of its divisors is an integer number (1777901300).

Almost surely, 2^21233220404 is an apocalyptic number.

It is an amenable number.

21233220404 is an abundant number, since it is smaller than the sum of its proper divisors (21436410796).

21233220404 is a wasteful number, since it uses less digits than its factorization.

21233220404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25398623 (or 25398621 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21233220404 its reverse (40402233212), we get a palindrome (61635453616).

The spelling of 21233220404 in words is "twenty-one billion, two hundred thirty-three million, two hundred twenty thousand, four hundred four".