20021100102001 has 4 divisors (see below), whose sum is σ = 20022097635904. Its totient is φ = 20020102568100.

The previous prime is 20021100101987. The next prime is 20021100102041. The reversal of 20021100102001 is 10020100112002.

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 20021100102001 - 2¹³ = 20021100093809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021100102041) 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, 498736845 + ... + 498776986.

It is an arithmetic number, because the mean of its divisors is an integer number (5005524408976).

Almost surely, 2^{20021100102001} is an apocalyptic number.

It is an amenable number.

20021100102001 is a deficient number, since it is larger than the sum of its proper divisors (997533903).

20021100102001 is an equidigital number, since it uses as much as digits as its factorization.

20021100102001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997533902.

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

Adding to 20021100102001 its reverse (10020100112002), we get a palindrome (30041200214003).

The spelling of 20021100102001 in words is "twenty trillion, twenty-one billion, one hundred million, one hundred two thousand, one".