21412444489 has 2 divisors, whose sum is σ = 21412444490. Its totient is φ = 21412444488.

The previous prime is 21412444483. The next prime is 21412444519. The reversal of 21412444489 is 98444421412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19069400464 + 2343044025 = 138092^2 + 48405^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21412444489 is a prime.

It is a super-2 number, since 2×21412444489² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21412444483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10706222244 + 10706222245.

It is an arithmetic number, because the mean of its divisors is an integer number (10706222245).

Almost surely, 2^21412444489 is an apocalyptic number.

It is an amenable number.

21412444489 is a deficient number, since it is larger than the sum of its proper divisors (1).

21412444489 is an equidigital number, since it uses as much as digits as its factorization.

21412444489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 294912, while the sum is 43.

The spelling of 21412444489 in words is "twenty-one billion, four hundred twelve million, four hundred forty-four thousand, four hundred eighty-nine".