221021122121209 has 8 divisors (see below), whose sum is σ = 224403057266400. Its totient is φ = 217641631459296.

The previous prime is 221021122121171. The next prime is 221021122121251. The reversal of 221021122121209 is 902121221120122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221021122121209 - 2⁹ = 221021122120697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221021122101209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 610938604 + ... + 611300269.

It is an arithmetic number, because the mean of its divisors is an integer number (28050382158300).

Almost surely, 2^{221021122121209} is an apocalyptic number.

It is an amenable number.

221021122121209 is a deficient number, since it is larger than the sum of its proper divisors (3381935145191).

221021122121209 is a wasteful number, since it uses less digits than its factorization.

221021122121209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222241639.

The product of its (nonzero) digits is 1152, while the sum is 28.

The spelling of 221021122121209 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred nine".