2143432021321 has 4 divisors (see below), whose sum is σ = 2164654120644. Its totient is φ = 2122209922000.

The previous prime is 2143432021307. The next prime is 2143432021343. The reversal of 2143432021321 is 1231202343412.

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 1509077118025 + 634354903296 = 1228445^2 + 796464^2 .

It is a cyclic number.

It is not a de Polignac number, because 2143432021321 - 2¹⁵ = 2143431988553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2143432021321.

It is not an unprimeable number, because it can be changed into a prime (2143432021921) 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, 10611049510 + ... + 10611049711.

It is an arithmetic number, because the mean of its divisors is an integer number (541163530161).

Almost surely, 2^{2143432021321} is an apocalyptic number.

It is an amenable number.

2143432021321 is a deficient number, since it is larger than the sum of its proper divisors (21222099323).

2143432021321 is a wasteful number, since it uses less digits than its factorization.

2143432021321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21222099322.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 2143432021321 its reverse (1231202343412), we get a palindrome (3374634364733).

The spelling of 2143432021321 in words is "two trillion, one hundred forty-three billion, four hundred thirty-two million, twenty-one thousand, three hundred twenty-one".