21011210489 has 2 divisors, whose sum is σ = 21011210490. Its totient is φ = 21011210488.

The previous prime is 21011210459. The next prime is 21011210497. The reversal of 21011210489 is 98401211012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12485827600 + 8525382889 = 111740^2 + 92333^2 .

It is a cyclic number.

It is not a de Polignac number, because 21011210489 - 2¹² = 21011206393 is a prime.

It is not a weakly prime, because it can be changed into another prime (21011210419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505605244 + 10505605245.

It is an arithmetic number, because the mean of its divisors is an integer number (10505605245).

Almost surely, 2^21011210489 is an apocalyptic number.

It is an amenable number.

21011210489 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011210489 is an equidigital number, since it uses as much as digits as its factorization.

21011210489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 29.

The spelling of 21011210489 in words is "twenty-one billion, eleven million, two hundred ten thousand, four hundred eighty-nine".