20021012110121 has 12 divisors (see below), whose sum is σ = 23301070975476. Its totient is φ = 17130277739520.

The previous prime is 20021012110117. The next prime is 20021012110163. The reversal of 20021012110121 is 12101121012002.

It can be written as a sum of positive squares in 2 ways, for example, as 6850180771225 + 13170831338896 = 2617285^2 + 3629164^2 .

It is not a de Polignac number, because 20021012110121 - 2² = 20021012110117 is a prime.

It is a super-2 number, since 2×20021012110121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021012110096 and 20021012110105.

It is not an unprimeable number, because it can be changed into a prime (20021012110171) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4866554120 + ... + 4866558233.

It is an arithmetic number, because the mean of its divisors is an integer number (1941755914623).

Almost surely, 2^{20021012110121} is an apocalyptic number.

It is an amenable number.

20021012110121 is a deficient number, since it is larger than the sum of its proper divisors (3280058865355).

20021012110121 is a wasteful number, since it uses less digits than its factorization.

20021012110121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9733112392 (or 9733112381 counting only the distinct ones).

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

Adding to 20021012110121 its reverse (12101121012002), we get a palindrome (32122133122123).

The spelling of 20021012110121 in words is "twenty trillion, twenty-one billion, twelve million, one hundred ten thousand, one hundred twenty-one".