20202111221221 has 8 divisors (see below), whose sum is σ = 20708642062080. Its totient is φ = 19698776159088.

The previous prime is 20202111221219. The next prime is 20202111221231. The reversal of 20202111221221 is 12212211120202.

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 20202111221221 - 2¹ = 20202111221219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20202111221231) 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, 798931881 + ... + 798957166.

It is an arithmetic number, because the mean of its divisors is an integer number (2588580257760).

Almost surely, 2^{20202111221221} is an apocalyptic number.

It is an amenable number.

20202111221221 is a deficient number, since it is larger than the sum of its proper divisors (506530840859).

20202111221221 is a wasteful number, since it uses less digits than its factorization.

20202111221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1597889363.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 20202111221221 its reverse (12212211120202), we get a palindrome (32414322341423).

The spelling of 20202111221221 in words is "twenty trillion, two hundred two billion, one hundred eleven million, two hundred twenty-one thousand, two hundred twenty-one".