2102011021 has 8 divisors (see below), whose sum is σ = 2413792800. Its totient is φ = 1810344240.

The previous prime is 2102011013. The next prime is 2102011039. The reversal of 2102011021 is 1201102012.

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 2102011021 - 2³ = 2102011013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2102010989 and 2102011007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102011061) 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, 5028526 + ... + 5028943.

It is an arithmetic number, because the mean of its divisors is an integer number (301724100).

Almost surely, 2^2102011021 is an apocalyptic number.

It is an amenable number.

2102011021 is a deficient number, since it is larger than the sum of its proper divisors (311781779).

2102011021 is a wasteful number, since it uses less digits than its factorization.

2102011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10057499.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 2102011021 is about 45847.6937369809. The cubic root of 2102011021 is about 1280.9878078412.

Adding to 2102011021 its reverse (1201102012), we get a palindrome (3303113033).

Subtracting from 2102011021 its reverse (1201102012), we obtain a palindrome (900909009).

It can be divided in two parts, 21020 and 11021, that added together give a square (32041 = 179²).

The spelling of 2102011021 in words is "two billion, one hundred two million, eleven thousand, twenty-one".