21204224412 has 48 divisors (see below), whose sum is σ = 56578851840. Its totient is φ = 6054679872.

The previous prime is 21204224407. The next prime is 21204224413. The reversal of 21204224412 is 21442240212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204224413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64573 + ... + 215819.

It is an arithmetic number, because the mean of its divisors is an integer number (1178726080).

Almost surely, 2^21204224412 is an apocalyptic number.

It is an amenable number.

21204224412 is an abundant number, since it is smaller than the sum of its proper divisors (35374627428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21204224412 is a wasteful number, since it uses less digits than its factorization.

21204224412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152930 (or 152928 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 21204224412 its reverse (21442240212), we get a palindrome (42646464624).

The spelling of 21204224412 in words is "twenty-one billion, two hundred four million, two hundred twenty-four thousand, four hundred twelve".