21212201489 has 2 divisors, whose sum is σ = 21212201490. Its totient is φ = 21212201488.

The previous prime is 21212201429. The next prime is 21212201567. The reversal of 21212201489 is 98410221212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21197030464 + 15171025 = 145592^2 + 3895^2 .

It is a cyclic number.

It is not a de Polignac number, because 21212201489 - 2¹⁶ = 21212135953 is a prime.

It is not a weakly prime, because it can be changed into another prime (21212201429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606100744 + 10606100745.

It is an arithmetic number, because the mean of its divisors is an integer number (10606100745).

Almost surely, 2^21212201489 is an apocalyptic number.

It is an amenable number.

21212201489 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212201489 is an equidigital number, since it uses as much as digits as its factorization.

21212201489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 32.

The spelling of 21212201489 in words is "twenty-one billion, two hundred twelve million, two hundred one thousand, four hundred eighty-nine".