20020021100021 has 8 divisors (see below), whose sum is σ = 20486044275840. Its totient is φ = 19554017982912.

The previous prime is 20020021099973. The next prime is 20020021100059. The reversal of 20020021100021 is 12000112002002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20020021100021 - 2²² = 20020016905717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20020021099975 and 20020021100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020021100921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2985860 + ... + 6996813.

It is an arithmetic number, because the mean of its divisors is an integer number (2560755534480).

Almost surely, 2^{20020021100021} is an apocalyptic number.

It is an amenable number.

20020021100021 is a deficient number, since it is larger than the sum of its proper divisors (466023175819).

20020021100021 is an equidigital number, since it uses as much as digits as its factorization.

20020021100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10029355.

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

Adding to 20020021100021 its reverse (12000112002002), we get a palindrome (32020133102023).

The spelling of 20020021100021 in words is "twenty trillion, twenty billion, twenty-one million, one hundred thousand, twenty-one".