221002120211209 has 4 divisors (see below), whose sum is σ = 223664796358416. Its totient is φ = 218339444064004.

The previous prime is 221002120211183. The next prime is 221002120211239. The reversal of 221002120211209 is 902112021200122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221002120211209 - 2⁵ = 221002120211177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221002120211239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1331338073479 + ... + 1331338073644.

It is an arithmetic number, because the mean of its divisors is an integer number (55916199089604).

Almost surely, 2^{221002120211209} is an apocalyptic number.

It is an amenable number.

221002120211209 is a deficient number, since it is larger than the sum of its proper divisors (2662676147207).

221002120211209 is an equidigital number, since it uses as much as digits as its factorization.

221002120211209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2662676147206.

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 221002120211209 in words is "two hundred twenty-one trillion, two billion, one hundred twenty million, two hundred eleven thousand, two hundred nine".