20020020121001 has 4 divisors (see below), whose sum is σ = 20020598952900. Its totient is φ = 20019441289104.

The previous prime is 20020020120949. The next prime is 20020020121037. The reversal of 20020020121001 is 10012102002002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5723673456400 + 14296346664601 = 2392420^2 + 3781051^2 .

It is a cyclic number.

It is not a de Polignac number, because 20020020121001 - 2¹⁸ = 20020019858857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20020020121081) 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, 289364066 + ... + 289433243.

It is an arithmetic number, because the mean of its divisors is an integer number (5005149738225).

Almost surely, 2^{20020020121001} is an apocalyptic number.

It is an amenable number.

20020020121001 is a deficient number, since it is larger than the sum of its proper divisors (578831899).

20020020121001 is an equidigital number, since it uses as much as digits as its factorization.

20020020121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578831898.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20020020121001 its reverse (10012102002002), we get a palindrome (30032122123003).

The spelling of 20020020121001 in words is "twenty trillion, twenty billion, twenty million, one hundred twenty-one thousand, one".