20021303233021 has 4 divisors (see below), whose sum is σ = 20075857193152. Its totient is φ = 19966749272892.

The previous prime is 20021303232971. The next prime is 20021303233069. The reversal of 20021303233021 is 12033230312002.

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 20021303233021 - 2¹⁷ = 20021303101949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021303232983 and 20021303233001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021303263021) 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, 27276979515 + ... + 27276980248.

It is an arithmetic number, because the mean of its divisors is an integer number (5018964298288).

Almost surely, 2^{20021303233021} is an apocalyptic number.

It is an amenable number.

20021303233021 is a deficient number, since it is larger than the sum of its proper divisors (54553960131).

20021303233021 is an equidigital number, since it uses as much as digits as its factorization.

20021303233021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54553960130.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 20021303233021 its reverse (12033230312002), we get a palindrome (32054533545023).

The spelling of 20021303233021 in words is "twenty trillion, twenty-one billion, three hundred three million, two hundred thirty-three thousand, twenty-one".