21055301489 has 2 divisors, whose sum is σ = 21055301490. Its totient is φ = 21055301488.

The previous prime is 21055301479. The next prime is 21055301521. The reversal of 21055301489 is 98410355012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19967950864 + 1087350625 = 141308^2 + 32975^2 .

It is a cyclic number.

It is not a de Polignac number, because 21055301489 - 2¹⁶ = 21055235953 is a prime.

It is not a weakly prime, because it can be changed into another prime (21055301479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10527650744 + 10527650745.

It is an arithmetic number, because the mean of its divisors is an integer number (10527650745).

Almost surely, 2^21055301489 is an apocalyptic number.

It is an amenable number.

21055301489 is a deficient number, since it is larger than the sum of its proper divisors (1).

21055301489 is an equidigital number, since it uses as much as digits as its factorization.

21055301489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 38.

The spelling of 21055301489 in words is "twenty-one billion, fifty-five million, three hundred one thousand, four hundred eighty-nine".