21444134212 has 6 divisors (see below), whose sum is σ = 37527234878. Its totient is φ = 10722067104.

The previous prime is 21444134207. The next prime is 21444134269. The reversal of 21444134212 is 21243144412.

It can be written as a sum of positive squares in only one way, i.e., 12556547136 + 8887587076 = 112056^2 + 94274^2 .

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, 2680516773 + ... + 2680516780.

Almost surely, 2^21444134212 is an apocalyptic number.

It is an amenable number.

21444134212 is a deficient number, since it is larger than the sum of its proper divisors (16083100666).

21444134212 is a wasteful number, since it uses less digits than its factorization.

21444134212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5361033557 (or 5361033555 counting only the distinct ones).

The product of its digits is 6144, while the sum is 28.

Adding to 21444134212 its reverse (21243144412), we get a palindrome (42687278624).

The spelling of 21444134212 in words is "twenty-one billion, four hundred forty-four million, one hundred thirty-four thousand, two hundred twelve".