221002202009 has 2 divisors, whose sum is σ = 221002202010. Its totient is φ = 221002202008.

The previous prime is 221002201991. The next prime is 221002202053. The reversal of 221002202009 is 900202200122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181787113225 + 39215088784 = 426365^2 + 198028^2 .

It is a cyclic number.

It is not a de Polignac number, because 221002202009 - 2¹⁶ = 221002136473 is a prime.

It is not a weakly prime, because it can be changed into another prime (221002202209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110501101004 + 110501101005.

It is an arithmetic number, because the mean of its divisors is an integer number (110501101005).

Almost surely, 2^221002202009 is an apocalyptic number.

It is an amenable number.

221002202009 is a deficient number, since it is larger than the sum of its proper divisors (1).

221002202009 is an equidigital number, since it uses as much as digits as its factorization.

221002202009 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 221002202009 in words is "two hundred twenty-one billion, two million, two hundred two thousand, nine".