20020010121 has 6 divisors (see below), whose sum is σ = 28917792410. Its totient is φ = 13346673408.

The previous prime is 20020010111. The next prime is 20020010141. The reversal of 20020010121 is 12101002002.

It can be written as a sum of positive squares in only one way, i.e., 14700350025 + 5319660096 = 121245^2 + 72936^2 .

It is not a de Polignac number, because 20020010121 - 2¹⁷ = 20019879049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 2224445569 = 20020010121 / (2 + 0 + 0 + 2 + 0 + 0 + 1 + 0 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20020010111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1112222776 + ... + 1112222793.

Almost surely, 2^20020010121 is an apocalyptic number.

It is an amenable number.

20020010121 is a deficient number, since it is larger than the sum of its proper divisors (8897782289).

20020010121 is a wasteful number, since it uses less digits than its factorization.

20020010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2224445575 (or 2224445572 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20020010121 its reverse (12101002002), we get a palindrome (32121012123).

The spelling of 20020010121 in words is "twenty billion, twenty million, ten thousand, one hundred twenty-one".