20201121222121 has 8 divisors (see below), whose sum is σ = 23087095585280. Its totient is φ = 17315171834688.

The previous prime is 20201121222091. The next prime is 20201121222133. The reversal of 20201121222121 is 12122212110202.

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

It is not a de Polignac number, because 20201121222121 - 2⁷ = 20201121221993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20201121222521) 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, 4477401 + ... + 7774918.

It is an arithmetic number, because the mean of its divisors is an integer number (2885886948160).

Almost surely, 2^{20201121222121} is an apocalyptic number.

It is an amenable number.

20201121222121 is a deficient number, since it is larger than the sum of its proper divisors (2885974363159).

20201121222121 is a wasteful number, since it uses less digits than its factorization.

20201121222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12487863.

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

Adding to 20201121222121 its reverse (12122212110202), we get a palindrome (32323333332323).

The spelling of 20201121222121 in words is "twenty trillion, two hundred one billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred twenty-one".