20100022009 has 2 divisors, whose sum is σ = 20100022010. Its totient is φ = 20100022008.

The previous prime is 20100021983. The next prime is 20100022027. The reversal of 20100022009 is 90022000102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15538370409 + 4561651600 = 124653^2 + 67540^2 .

It is a cyclic number.

It is not a de Polignac number, because 20100022009 - 2⁷ = 20100021881 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20100021983 and 20100022001.

It is not a weakly prime, because it can be changed into another prime (20100022609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050011004 + 10050011005.

It is an arithmetic number, because the mean of its divisors is an integer number (10050011005).

Almost surely, 2^20100022009 is an apocalyptic number.

It is an amenable number.

20100022009 is a deficient number, since it is larger than the sum of its proper divisors (1).

20100022009 is an equidigital number, since it uses as much as digits as its factorization.

20100022009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

The spelling of 20100022009 in words is "twenty billion, one hundred million, twenty-two thousand, nine".