2101201001 has 4 divisors (see below), whose sum is σ = 2111760000. Its totient is φ = 2090642004.

The previous prime is 2101200991. The next prime is 2101201009. The reversal of 2101201001 is 1001021012.

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 2101201001 - 2³⁰ = 1027459177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2101201001.

It is not an unprimeable number, because it can be changed into a prime (2101201009) 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, 5279201 + ... + 5279598.

It is an arithmetic number, because the mean of its divisors is an integer number (527940000).

Almost surely, 2^2101201001 is an apocalyptic number.

It is an amenable number.

2101201001 is a deficient number, since it is larger than the sum of its proper divisors (10558999).

2101201001 is a wasteful number, since it uses less digits than its factorization.

2101201001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10558998.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 2101201001 is about 45838.8590717526. The cubic root of 2101201001 is about 1280.8232417746.

Adding to 2101201001 its reverse (1001021012), we get a palindrome (3102222013).

The spelling of 2101201001 in words is "two billion, one hundred one million, two hundred one thousand, one".