21203430004 has 6 divisors (see below), whose sum is σ = 37106002514. Its totient is φ = 10601715000.

The previous prime is 21203429987. The next prime is 21203430007. The reversal of 21203430004 is 40003430212.

It can be written as a sum of positive squares in only one way, i.e., 16028066404 + 5175363600 = 126602^2 + 71940^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203430007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2650428747 + ... + 2650428754.

Almost surely, 2^21203430004 is an apocalyptic number.

It is an amenable number.

21203430004 is a deficient number, since it is larger than the sum of its proper divisors (15902572510).

21203430004 is a wasteful number, since it uses less digits than its factorization.

21203430004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5300857505 (or 5300857503 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 21203430004 its reverse (40003430212), we get a palindrome (61206860216).

The spelling of 21203430004 in words is "twenty-one billion, two hundred three million, four hundred thirty thousand, four".