20021201101121 has 4 divisors (see below), whose sum is σ = 21841310292144. Its totient is φ = 18201091910100.

The previous prime is 20021201101103. The next prime is 20021201101169. The reversal of 20021201101121 is 12110110212002.

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 not a de Polignac number, because 20021201101121 - 2³⁴ = 20004021231937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021201101096 and 20021201101105.

It is not an unprimeable number, because it can be changed into a prime (20021201101171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 910054595495 + ... + 910054595516.

It is an arithmetic number, because the mean of its divisors is an integer number (5460327573036).

Almost surely, 2^{20021201101121} is an apocalyptic number.

It is an amenable number.

20021201101121 is a deficient number, since it is larger than the sum of its proper divisors (1820109191023).

20021201101121 is a wasteful number, since it uses less digits than its factorization.

20021201101121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1820109191022.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20021201101121 its reverse (12110110212002), we get a palindrome (32131311313123).

The spelling of 20021201101121 in words is "twenty trillion, twenty-one billion, two hundred one million, one hundred one thousand, one hundred twenty-one".