2120002021 has 4 divisors (see below), whose sum is σ = 2139815232. Its totient is φ = 2100188812.

The previous prime is 2120002013. The next prime is 2120002043. The reversal of 2120002021 is 1202000212.

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 2120002021 - 2³ = 2120002013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2120001989 and 2120002007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120002091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9906445 + ... + 9906658.

It is an arithmetic number, because the mean of its divisors is an integer number (534953808).

Almost surely, 2^2120002021 is an apocalyptic number.

It is an amenable number.

2120002021 is a deficient number, since it is larger than the sum of its proper divisors (19813211).

2120002021 is a wasteful number, since it uses less digits than its factorization.

2120002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19813210.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2120002021 is about 46043.4796795377. The cubic root of 2120002021 is about 1284.6320659263.

Adding to 2120002021 its reverse (1202000212), we get a palindrome (3322002233).

The spelling of 2120002021 in words is "two billion, one hundred twenty million, two thousand, twenty-one".