2120202021 has 16 divisors (see below), whose sum is σ = 3296720000. Its totient is φ = 1211543424.

The previous prime is 2120202017. The next prime is 2120202037. The reversal of 2120202021 is 1202020212.

It is not a de Polignac number, because 2120202021 - 2² = 2120202017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2120201988 and 2120202006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120202521) 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, 1029196 + ... + 1031253.

It is an arithmetic number, because the mean of its divisors is an integer number (206045000).

Almost surely, 2^2120202021 is an apocalyptic number.

2120202021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2120202021 is a deficient number, since it is larger than the sum of its proper divisors (1176517979).

2120202021 is an equidigital number, since it uses as much as digits as its factorization.

2120202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2060473 (or 2060459 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 2120202021 is about 46045.6514884956. The cubic root of 2120202021 is about 1284.6724618523.

Adding to 2120202021 its reverse (1202020212), we get a palindrome (3322222233).

It can be divided in two parts, 2 and 120202021, that multiplied together give a palindrome (240404042).

The spelling of 2120202021 in words is "two billion, one hundred twenty million, two hundred two thousand, twenty-one".