20010102001 has 4 divisors (see below), whose sum is σ = 20011129072. Its totient is φ = 20009074932.

The previous prime is 20010101963. The next prime is 20010102031. The reversal of 20010102001 is 10020101002.

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 20010102001 - 2¹¹ = 20010099953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20010102031) 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, 483735 + ... + 523468.

It is an arithmetic number, because the mean of its divisors is an integer number (5002782268).

Almost surely, 2^20010102001 is an apocalyptic number.

It is an amenable number.

20010102001 is a deficient number, since it is larger than the sum of its proper divisors (1027071).

20010102001 is a wasteful number, since it uses less digits than its factorization.

20010102001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027070.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 20010102001 its reverse (10020101002), we get a palindrome (30030203003).

Subtracting from 20010102001 its reverse (10020101002), we obtain a palindrome (9990000999).

The spelling of 20010102001 in words is "twenty billion, ten million, one hundred two thousand, one".