20020021001021 has 4 divisors (see below), whose sum is σ = 20020034961600. Its totient is φ = 20020007040444.

The previous prime is 20020021000981. The next prime is 20020021001039. The reversal of 20020021001021 is 12010012002002.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 20020021001021 - 2⁶ = 20020021000957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20020021000993 and 20020021001011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020081001021) 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, 4546331 + ... + 7791608.

It is an arithmetic number, because the mean of its divisors is an integer number (5005008740400).

Almost surely, 2^{20020021001021} is an apocalyptic number.

It is an amenable number.

20020021001021 is a deficient number, since it is larger than the sum of its proper divisors (13960579).

20020021001021 is a wasteful number, since it uses less digits than its factorization.

20020021001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13960578.

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

Adding to 20020021001021 its reverse (12010012002002), we get a palindrome (32030033003023).

The spelling of 20020021001021 in words is "twenty trillion, twenty billion, twenty-one million, one thousand, twenty-one".