20012102001 has 16 divisors (see below), whose sum is σ = 29654568000. Its totient is φ = 13338247104.

The previous prime is 20012101999. The next prime is 20012102017. The reversal of 20012102001 is 10020121002.

It is not a de Polignac number, because 20012102001 - 2¹ = 20012101999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (20012102081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31650 + ... + 202548.

It is an arithmetic number, because the mean of its divisors is an integer number (1853410500).

Almost surely, 2^20012102001 is an apocalyptic number.

It is an amenable number.

20012102001 is a deficient number, since it is larger than the sum of its proper divisors (9642465999).

20012102001 is a wasteful number, since it uses less digits than its factorization.

20012102001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175245 (or 175239 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20012102001 its reverse (10020121002), we get a palindrome (30032223003).

The spelling of 20012102001 in words is "twenty billion, twelve million, one hundred two thousand, one".