21332402143 has 4 divisors (see below), whose sum is σ = 22973356168. Its totient is φ = 19691448120.

The previous prime is 21332402071. The next prime is 21332402167. The reversal of 21332402143 is 34120423312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21332402143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21332402243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 820476993 + ... + 820477018.

It is an arithmetic number, because the mean of its divisors is an integer number (5743339042).

Almost surely, 2^21332402143 is an apocalyptic number.

21332402143 is a deficient number, since it is larger than the sum of its proper divisors (1640954025).

21332402143 is a wasteful number, since it uses less digits than its factorization.

21332402143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1640954024.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21332402143 its reverse (34120423312), we get a palindrome (55452825455).

The spelling of 21332402143 in words is "twenty-one billion, three hundred thirty-two million, four hundred two thousand, one hundred forty-three".