20021021201001 has 4 divisors (see below), whose sum is σ = 26694694934672. Its totient is φ = 13347347467332.

The previous prime is 20021021200997. The next prime is 20021021201003. The reversal of 20021021201001 is 10010212012002.

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 not a de Polignac number, because 20021021201001 - 2² = 20021021200997 is a prime.

It is a super-3 number, since 3×20021021201001³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021021201003) 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, 3336836866831 + ... + 3336836866836.

It is an arithmetic number, because the mean of its divisors is an integer number (6673673733668).

Almost surely, 2^{20021021201001} is an apocalyptic number.

It is an amenable number.

20021021201001 is a deficient number, since it is larger than the sum of its proper divisors (6673673733671).

20021021201001 is an equidigital number, since it uses as much as digits as its factorization.

20021021201001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6673673733670.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20021021201001 its reverse (10010212012002), we get a palindrome (30031233213003).

The spelling of 20021021201001 in words is "twenty trillion, twenty-one billion, twenty-one million, two hundred one thousand, one".