20000202021209 has 2 divisors, whose sum is σ = 20000202021210. Its totient is φ = 20000202021208.

The previous prime is 20000202021119. The next prime is 20000202021269. The reversal of 20000202021209 is 90212020200002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11958780673609 + 8041421347600 = 3458147^2 + 2835740^2 .

It is a cyclic number.

It is not a de Polignac number, because 20000202021209 - 2²⁴ = 20000185243993 is a prime.

It is not a weakly prime, because it can be changed into another prime (20000202021269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000101010604 + 10000101010605.

It is an arithmetic number, because the mean of its divisors is an integer number (10000101010605).

Almost surely, 2^{20000202021209} is an apocalyptic number.

It is an amenable number.

20000202021209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20000202021209 is an equidigital number, since it uses as much as digits as its factorization.

20000202021209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

The spelling of 20000202021209 in words is "twenty trillion, two hundred two million, twenty-one thousand, two hundred nine".