21230424002 has 4 divisors (see below), whose sum is σ = 31845636006. Its totient is φ = 10615212000.

The previous prime is 21230423993. The next prime is 21230424029. The reversal of 21230424002 is 20042403212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14623823041 + 6606600961 = 120929^2 + 81281^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5307605999 + ... + 5307606002.

Almost surely, 2^21230424002 is an apocalyptic number.

21230424002 is a deficient number, since it is larger than the sum of its proper divisors (10615212004).

21230424002 is a wasteful number, since it uses less digits than its factorization.

21230424002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10615212003.

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21230424002 its reverse (20042403212), we get a palindrome (41272827214).

The spelling of 21230424002 in words is "twenty-one billion, two hundred thirty million, four hundred twenty-four thousand, two".