2142112021 has 4 divisors (see below), whose sum is σ = 2448128032. Its totient is φ = 1836096012.

The previous prime is 2142112009. The next prime is 2142112031. The reversal of 2142112021 is 1202112412.

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 2142112021 - 2⁵ = 2142111989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2142111986 and 2142112004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2142112031) 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 3 ways as a sum of consecutive naturals, for example, 153007995 + ... + 153008008.

It is an arithmetic number, because the mean of its divisors is an integer number (612032008).

Almost surely, 2^2142112021 is an apocalyptic number.

It is an amenable number.

2142112021 is a deficient number, since it is larger than the sum of its proper divisors (306016011).

2142112021 is an equidigital number, since it uses as much as digits as its factorization.

2142112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306016010.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 2142112021 is about 46282.9560529576. The cubic root of 2142112021 is about 1289.0825399647.

Adding to 2142112021 its reverse (1202112412), we get a palindrome (3344224433).

The spelling of 2142112021 in words is "two billion, one hundred forty-two million, one hundred twelve thousand, twenty-one".