21552303412 has 6 divisors (see below), whose sum is σ = 37716530978. Its totient is φ = 10776151704.

The previous prime is 21552303407. The next prime is 21552303413. The reversal of 21552303412 is 21430325512.

It can be written as a sum of positive squares in only one way, i.e., 17391279376 + 4161024036 = 131876^2 + 64506^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21552303413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2694037923 + ... + 2694037930.

Almost surely, 2^21552303412 is an apocalyptic number.

It is an amenable number.

21552303412 is a deficient number, since it is larger than the sum of its proper divisors (16164227566).

21552303412 is a wasteful number, since it uses less digits than its factorization.

21552303412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5388075857 (or 5388075855 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 21552303412 its reverse (21430325512), we get a palindrome (42982628924).

The spelling of 21552303412 in words is "twenty-one billion, five hundred fifty-two million, three hundred three thousand, four hundred twelve".