2100020001 has 8 divisors (see below), whose sum is σ = 2807226240. Its totient is φ = 1396413552.

The previous prime is 2100019993. The next prime is 2100020003. The reversal of 2100020001 is 1000200012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2100020001 - 2³ = 2100019993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2100020003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 898585 + ... + 900918.

It is an arithmetic number, because the mean of its divisors is an integer number (350903280).

Almost surely, 2^2100020001 is an apocalyptic number.

It is an amenable number.

2100020001 is a deficient number, since it is larger than the sum of its proper divisors (707206239).

2100020001 is a wasteful number, since it uses less digits than its factorization.

2100020001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1799895.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 2100020001 is about 45825.9751778399. The cubic root of 2100020001 is about 1280.5832305085.

Adding to 2100020001 its reverse (1000200012), we get a palindrome (3100220013).

It can be divided in two parts, 2 and 100020001, that multiplied together give a palindrome (200040002).

The spelling of 2100020001 in words is "two billion, one hundred million, twenty thousand, one".