2021000220209 has 2 divisors, whose sum is σ = 2021000220210. Its totient is φ = 2021000220208.

The previous prime is 2021000220157. The next prime is 2021000220223. The reversal of 2021000220209 is 9020220001202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1675867469809 + 345132750400 = 1294553^2 + 587480^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021000220209 is a prime.

It is not a weakly prime, because it can be changed into another prime (2021000220229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010500110104 + 1010500110105.

It is an arithmetic number, because the mean of its divisors is an integer number (1010500110105).

Almost surely, 2^{2021000220209} is an apocalyptic number.

It is an amenable number.

2021000220209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021000220209 is an equidigital number, since it uses as much as digits as its factorization.

2021000220209 is an evil number, because the sum of its binary digits is even.

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

The spelling of 2021000220209 in words is "two trillion, twenty-one billion, two hundred twenty thousand, two hundred nine".