20020012021 has 4 divisors (see below), whose sum is σ = 20039281600. Its totient is φ = 20000742444.

The previous prime is 20020012013. The next prime is 20020012043. The reversal of 20020012021 is 12021002002.

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 20020012021 - 2³ = 20020012013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20020011989 and 20020012007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20026012021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9633231 + ... + 9635308.

It is an arithmetic number, because the mean of its divisors is an integer number (5009820400).

Almost surely, 2^20020012021 is an apocalyptic number.

It is an amenable number.

20020012021 is a deficient number, since it is larger than the sum of its proper divisors (19269579).

20020012021 is a wasteful number, since it uses less digits than its factorization.

20020012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19269578.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20020012021 its reverse (12021002002), we get a palindrome (32041014023).

The spelling of 20020012021 in words is "twenty billion, twenty million, twelve thousand, twenty-one".