2101002121 has 16 divisors (see below), whose sum is σ = 2290579200. Its totient is φ = 1919490048.

The previous prime is 2101002061. The next prime is 2101002143. The reversal of 2101002121 is 1212001012.

It is a de Polignac number, because none of the positive numbers 2^k-2101002121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2101002098 and 2101002107.

It is not an unprimeable number, because it can be changed into a prime (2101002151) 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, 606025 + ... + 609481.

It is an arithmetic number, because the mean of its divisors is an integer number (143161200).

Almost surely, 2^2101002121 is an apocalyptic number.

It is an amenable number.

2101002121 is a deficient number, since it is larger than the sum of its proper divisors (189577079).

2101002121 is a wasteful number, since it uses less digits than its factorization.

2101002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4608.

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

The square root of 2101002121 is about 45836.6896819567. The cubic root of 2101002121 is about 1280.7828302570.

Adding to 2101002121 its reverse (1212001012), we get a palindrome (3313003133).

The spelling of 2101002121 in words is "two billion, one hundred one million, two thousand, one hundred twenty-one".