2101001021 has 8 divisors (see below), whose sum is σ = 2401422144. Its totient is φ = 1800649440.

The previous prime is 2101001009. The next prime is 2101001029. The reversal of 2101001021 is 1201001012.

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

It is a cyclic number.

It is not a de Polignac number, because 2101001021 - 2¹⁴ = 2100984637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101001029) 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, 102401 + ... + 121193.

It is an arithmetic number, because the mean of its divisors is an integer number (300177768).

Almost surely, 2^2101001021 is an apocalyptic number.

It is an amenable number.

2101001021 is a deficient number, since it is larger than the sum of its proper divisors (300421123).

2101001021 is a wasteful number, since it uses less digits than its factorization.

2101001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34771.

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

The square root of 2101001021 is about 45836.6776828339. The cubic root of 2101001021 is about 1280.7826067349.

Adding to 2101001021 its reverse (1201001012), we get a palindrome (3302002033).

Subtracting from 2101001021 its reverse (1201001012), we obtain a palindrome (900000009).

The spelling of 2101001021 in words is "two billion, one hundred one million, one thousand, twenty-one".