20021102001001 has 4 divisors (see below), whose sum is σ = 21074844211600. Its totient is φ = 18967359790404.

The previous prime is 20021102000989. The next prime is 20021102001011. The reversal of 20021102001001 is 10010020112002.

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 20021102001001 - 2⁹ = 20021102000489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021102001011) 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, 526871105271 + ... + 526871105308.

It is an arithmetic number, because the mean of its divisors is an integer number (5268711052900).

Almost surely, 2^{20021102001001} is an apocalyptic number.

It is an amenable number.

20021102001001 is a deficient number, since it is larger than the sum of its proper divisors (1053742210599).

20021102001001 is a wasteful number, since it uses less digits than its factorization.

20021102001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053742210598.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20021102001001 its reverse (10010020112002), we get a palindrome (30031122113003).

The spelling of 20021102001001 in words is "twenty trillion, twenty-one billion, one hundred two million, one thousand, one".