2120212021 has 4 divisors (see below), whose sum is σ = 2120673312. Its totient is φ = 2119750732.

The previous prime is 2120212019. The next prime is 2120212063. The reversal of 2120212021 is 1202120212.

It is a happy number.

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 2120212021 - 2¹ = 2120212019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2120211992 and 2120212010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120212321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223681 + ... + 232966.

It is an arithmetic number, because the mean of its divisors is an integer number (530168328).

Almost surely, 2^2120212021 is an apocalyptic number.

It is an amenable number.

2120212021 is a deficient number, since it is larger than the sum of its proper divisors (461291).

2120212021 is an equidigital number, since it uses as much as digits as its factorization.

2120212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461290.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 2120212021 is about 46045.7600762546. The cubic root of 2120212021 is about 1284.6744815819.

Adding to 2120212021 its reverse (1202120212), we get a palindrome (3322332233).

It can be divided in two parts, 2 and 120212021, that multiplied together give a palindrome (240424042).

The spelling of 2120212021 in words is "two billion, one hundred twenty million, two hundred twelve thousand, twenty-one".