21321231120289 has 2 divisors, whose sum is σ = 21321231120290. Its totient is φ = 21321231120288.

The previous prime is 21321231120263. The next prime is 21321231120323. The reversal of 21321231120289 is 98202113212312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13920301304064 + 7400929816225 = 3730992^2 + 2720465^2 .

It is a cyclic number.

It is not a de Polignac number, because 21321231120289 - 2²¹ = 21321229023137 is a prime.

It is not a weakly prime, because it can be changed into another prime (21321231120239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660615560144 + 10660615560145.

It is an arithmetic number, because the mean of its divisors is an integer number (10660615560145).

Almost surely, 2^{21321231120289} is an apocalyptic number.

It is an amenable number.

21321231120289 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321231120289 is an equidigital number, since it uses as much as digits as its factorization.

21321231120289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 37.

The spelling of 21321231120289 in words is "twenty-one trillion, three hundred twenty-one billion, two hundred thirty-one million, one hundred twenty thousand, two hundred eighty-nine".