20001122202121 has 4 divisors (see below), whose sum is σ = 20646319692544. Its totient is φ = 19355924711700.

The previous prime is 20001122202067. The next prime is 20001122202133. The reversal of 20001122202121 is 12120222110002.

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 20001122202121 - 2¹⁹ = 20001121677833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001122202095 and 20001122202104.

It is not an unprimeable number, because it can be changed into a prime (20001122202821) 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, 322598745165 + ... + 322598745226.

It is an arithmetic number, because the mean of its divisors is an integer number (5161579923136).

Almost surely, 2^{20001122202121} is an apocalyptic number.

It is an amenable number.

20001122202121 is a deficient number, since it is larger than the sum of its proper divisors (645197490423).

20001122202121 is an equidigital number, since it uses as much as digits as its factorization.

20001122202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645197490422.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20001122202121 its reverse (12120222110002), we get a palindrome (32121344312123).

The spelling of 20001122202121 in words is "twenty trillion, one billion, one hundred twenty-two million, two hundred two thousand, one hundred twenty-one".