2143210042021 has 4 divisors (see below), whose sum is σ = 2143329652044. Its totient is φ = 2143090432000.

The previous prime is 2143210042009. The next prime is 2143210042049. The reversal of 2143210042021 is 1202400123412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1048905753921 + 1094304288100 = 1024161^2 + 1046090^2 .

It is a cyclic number.

It is not a de Polignac number, because 2143210042021 - 2⁵ = 2143210041989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2143210041983 and 2143210042001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2143210045021) 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, 59778130 + ... + 59813971.

It is an arithmetic number, because the mean of its divisors is an integer number (535832413011).

Almost surely, 2^{2143210042021} is an apocalyptic number.

It is an amenable number.

2143210042021 is a deficient number, since it is larger than the sum of its proper divisors (119610023).

2143210042021 is a wasteful number, since it uses less digits than its factorization.

2143210042021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119610022.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 2143210042021 its reverse (1202400123412), we get a palindrome (3345610165433).

The spelling of 2143210042021 in words is "two trillion, one hundred forty-three billion, two hundred ten million, forty-two thousand, twenty-one".