21001120022009 has 2 divisors, whose sum is σ = 21001120022010. Its totient is φ = 21001120022008.

The previous prime is 21001120021993. The next prime is 21001120022053. The reversal of 21001120022009 is 90022002110012.

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., 19261960434025 + 1739159587984 = 4388845^2 + 1318772^2 .

It is a cyclic number.

It is not a de Polignac number, because 21001120022009 - 2⁴ = 21001120021993 is a prime.

It is not a weakly prime, because it can be changed into another prime (21001120022209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500560011004 + 10500560011005.

It is an arithmetic number, because the mean of its divisors is an integer number (10500560011005).

Almost surely, 2^{21001120022009} is an apocalyptic number.

It is an amenable number.

21001120022009 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001120022009 is an equidigital number, since it uses as much as digits as its factorization.

21001120022009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 21001120022009 in words is "twenty-one trillion, one billion, one hundred twenty million, twenty-two thousand, nine".