20021100121101 has 4 divisors (see below), whose sum is σ = 26694800161472. Its totient is φ = 13347400080732.

The previous prime is 20021100121097. The next prime is 20021100121133. The reversal of 20021100121101 is 10112100112002.

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 20021100121101 - 2² = 20021100121097 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 (20021100121151) 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, 3336850020181 + ... + 3336850020186.

It is an arithmetic number, because the mean of its divisors is an integer number (6673700040368).

Almost surely, 2^{20021100121101} is an apocalyptic number.

It is an amenable number.

20021100121101 is a deficient number, since it is larger than the sum of its proper divisors (6673700040371).

20021100121101 is an equidigital number, since it uses as much as digits as its factorization.

20021100121101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6673700040370.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20021100121101 its reverse (10112100112002), we get a palindrome (30133200233103).

Subtracting from 20021100121101 its reverse (10112100112002), we obtain a palindrome (9909000009099).

The spelling of 20021100121101 in words is "twenty trillion, twenty-one billion, one hundred million, one hundred twenty-one thousand, one hundred one".