2143311021 has 6 divisors (see below), whose sum is σ = 3095893710. Its totient is φ = 1428874008.

The previous prime is 2143311019. The next prime is 2143311029. The reversal of 2143311021 is 1201133412.

It can be written as a sum of positive squares in only one way, i.e., 1974024900 + 169286121 = 44430^2 + 13011^2 .

It is not a de Polignac number, because 2143311021 - 2¹ = 2143311019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2143310985 and 2143311003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2143311029) 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 5 ways as a sum of consecutive naturals, for example, 119072826 + ... + 119072843.

It is an arithmetic number, because the mean of its divisors is an integer number (515982285).

Almost surely, 2^2143311021 is an apocalyptic number.

It is an amenable number.

2143311021 is a deficient number, since it is larger than the sum of its proper divisors (952582689).

2143311021 is a wasteful number, since it uses less digits than its factorization.

2143311021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238145675 (or 238145672 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 2143311021 is about 46295.9071733128. The cubic root of 2143311021 is about 1289.3230069534.

Adding to 2143311021 its reverse (1201133412), we get a palindrome (3344444433).

The spelling of 2143311021 in words is "two billion, one hundred forty-three million, three hundred eleven thousand, twenty-one".