220001021209 has 2 divisors, whose sum is σ = 220001021210. Its totient is φ = 220001021208.

The previous prime is 220001021117. The next prime is 220001021249. The reversal of 220001021209 is 902120100022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150544000000 + 69457021209 = 388000^2 + 263547^2 .

It is a cyclic number.

It is not a de Polignac number, because 220001021209 - 2¹³ = 220001013017 is a prime.

It is not a weakly prime, because it can be changed into another prime (220001021249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110000510604 + 110000510605.

It is an arithmetic number, because the mean of its divisors is an integer number (110000510605).

Almost surely, 2^220001021209 is an apocalyptic number.

It is an amenable number.

220001021209 is a deficient number, since it is larger than the sum of its proper divisors (1).

220001021209 is an equidigital number, since it uses as much as digits as its factorization.

220001021209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

The spelling of 220001021209 in words is "two hundred twenty billion, one million, twenty-one thousand, two hundred nine".