21144433012 has 6 divisors (see below), whose sum is σ = 37002757778. Its totient is φ = 10572216504.

The previous prime is 21144433007. The next prime is 21144433027. The reversal of 21144433012 is 21033444112.

It can be written as a sum of positive squares in only one way, i.e., 21002965776 + 141467236 = 144924^2 + 11894^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2643054123 + ... + 2643054130.

Almost surely, 2^21144433012 is an apocalyptic number.

It is an amenable number.

21144433012 is a deficient number, since it is larger than the sum of its proper divisors (15858324766).

21144433012 is a wasteful number, since it uses less digits than its factorization.

21144433012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5286108257 (or 5286108255 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21144433012 its reverse (21033444112), we get a palindrome (42177877124).

The spelling of 21144433012 in words is "twenty-one billion, one hundred forty-four million, four hundred thirty-three thousand, twelve".