20010101001 has 16 divisors (see below), whose sum is σ = 29109194688. Its totient is φ = 12125836800.

The previous prime is 20010100991. The next prime is 20010101011. The reversal of 20010101001 is 10010101002.

It is an interprime number because it is at equal distance from previous prime (20010100991) and next prime (20010101011).

It is not a de Polignac number, because 20010101001 - 2⁹ = 20010100489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20010101011) 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, 272145 + ... + 337761.

It is an arithmetic number, because the mean of its divisors is an integer number (1819324668).

Almost surely, 2^20010101001 is an apocalyptic number.

It is an amenable number.

20010101001 is a deficient number, since it is larger than the sum of its proper divisors (9099093687).

20010101001 is a wasteful number, since it uses less digits than its factorization.

20010101001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74872.

The product of its (nonzero) digits is 2, while the sum is 6.

Adding to 20010101001 its reverse (10010101002), we get a palindrome (30020202003).

Subtracting from 20010101001 its reverse (10010101002), we obtain a palindrome (9999999999).

The spelling of 20010101001 in words is "twenty billion, ten million, one hundred one thousand, one".