20021020110121 has 4 divisors (see below), whose sum is σ = 20666859468544. Its totient is φ = 19375180751700.

The previous prime is 20021020110107. The next prime is 20021020110181. The reversal of 20021020110121 is 12101102012002.

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 20021020110121 - 2¹¹ = 20021020108073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021020110181) 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, 322919679165 + ... + 322919679226.

It is an arithmetic number, because the mean of its divisors is an integer number (5166714867136).

Almost surely, 2^{20021020110121} is an apocalyptic number.

It is an amenable number.

20021020110121 is a deficient number, since it is larger than the sum of its proper divisors (645839358423).

20021020110121 is an equidigital number, since it uses as much as digits as its factorization.

20021020110121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645839358422.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20021020110121 its reverse (12101102012002), we get a palindrome (32122122122123).

The spelling of 20021020110121 in words is "twenty trillion, twenty-one billion, twenty million, one hundred ten thousand, one hundred twenty-one".