2121012021 has 8 divisors (see below), whose sum is σ = 2994369984. Its totient is φ = 1330831040.

The previous prime is 2121011927. The next prime is 2121012031. The reversal of 2121012021 is 1202101212.

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 2121012021 - 2⁹ = 2121011509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121011988 and 2121012006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121012031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20794185 + ... + 20794286.

It is an arithmetic number, because the mean of its divisors is an integer number (374296248).

Almost surely, 2^2121012021 is an apocalyptic number.

It is an amenable number.

2121012021 is a deficient number, since it is larger than the sum of its proper divisors (873357963).

2121012021 is a wasteful number, since it uses less digits than its factorization.

2121012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41588491.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 2121012021 is about 46054.4462674344. The cubic root of 2121012021 is about 1284.8360393789.

Adding to 2121012021 its reverse (1202101212), we get a palindrome (3323113233).

The spelling of 2121012021 in words is "two billion, one hundred twenty-one million, twelve thousand, twenty-one".