20021021202001 has 8 divisors (see below), whose sum is σ = 20348545795200. Its totient is φ = 19695968492928.

The previous prime is 20021021201977. The next prime is 20021021202043. The reversal of 20021021202001 is 10020212012002.

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 20021021202001 - 2²⁵ = 20020987647569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021021202101) 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, 617954701 + ... + 617987098.

It is an arithmetic number, because the mean of its divisors is an integer number (2543568224400).

Almost surely, 2^{20021021202001} is an apocalyptic number.

It is an amenable number.

20021021202001 is a deficient number, since it is larger than the sum of its proper divisors (327524593199).

20021021202001 is a wasteful number, since it uses less digits than its factorization.

20021021202001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235942063.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20021021202001 its reverse (10020212012002), we get a palindrome (30041233214003).

The spelling of 20021021202001 in words is "twenty trillion, twenty-one billion, twenty-one million, two hundred two thousand, one".