21024403012 has 6 divisors (see below), whose sum is σ = 36792705278. Its totient is φ = 10512201504.

The previous prime is 21024403009. The next prime is 21024403021. The reversal of 21024403012 is 21030442012.

It can be written as a sum of positive squares in only one way, i.e., 20355870276 + 668532736 = 142674^2 + 25856^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2628050373 + ... + 2628050380.

Almost surely, 2^21024403012 is an apocalyptic number.

It is an amenable number.

21024403012 is a deficient number, since it is larger than the sum of its proper divisors (15768302266).

21024403012 is a wasteful number, since it uses less digits than its factorization.

21024403012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5256100757 (or 5256100755 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21024403012 its reverse (21030442012), we get a palindrome (42054845024).

The spelling of 21024403012 in words is "twenty-one billion, twenty-four million, four hundred three thousand, twelve".