21284698189 has 2 divisors, whose sum is σ = 21284698190. Its totient is φ = 21284698188.

The previous prime is 21284698159. The next prime is 21284698199. The reversal of 21284698189 is 98189648212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21004704900 + 279993289 = 144930^2 + 16733^2 .

It is a cyclic number.

It is not a de Polignac number, because 21284698189 - 2¹³ = 21284689997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21284698129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10642349094 + 10642349095.

It is an arithmetic number, because the mean of its divisors is an integer number (10642349095).

Almost surely, 2^21284698189 is an apocalyptic number.

It is an amenable number.

21284698189 is a deficient number, since it is larger than the sum of its proper divisors (1).

21284698189 is an equidigital number, since it uses as much as digits as its factorization.

21284698189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3981312, while the sum is 58.

The spelling of 21284698189 in words is "twenty-one billion, two hundred eighty-four million, six hundred ninety-eight thousand, one hundred eighty-nine".