21020022022009 has 2 divisors, whose sum is σ = 21020022022010. Its totient is φ = 21020022022008.

The previous prime is 21020022022007. The next prime is 21020022022019. The reversal of 21020022022009 is 90022022002012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18960337796409 + 2059684225600 = 4354347^2 + 1435160^2 .

It is a cyclic number.

It is not a de Polignac number, because 21020022022009 - 2¹ = 21020022022007 is a prime.

Together with 21020022022007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21020022022003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510011011004 + 10510011011005.

It is an arithmetic number, because the mean of its divisors is an integer number (10510011011005).

Almost surely, 2^{21020022022009} is an apocalyptic number.

It is an amenable number.

21020022022009 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020022022009 is an equidigital number, since it uses as much as digits as its factorization.

21020022022009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

The spelling of 21020022022009 in words is "twenty-one trillion, twenty billion, twenty-two million, twenty-two thousand, nine".