21432012143 has 4 divisors (see below), whose sum is σ = 21432852840. Its totient is φ = 21431171448.

The previous prime is 21432012097. The next prime is 21432012157. The reversal of 21432012143 is 34121023412.

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

It is a cyclic number.

It is not a de Polignac number, because 21432012143 - 2¹⁰ = 21432011119 is a prime.

It is a super-2 number, since 2×21432012143² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21432032143) 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, 380873 + ... + 433506.

It is an arithmetic number, because the mean of its divisors is an integer number (5358213210).

Almost surely, 2^21432012143 is an apocalyptic number.

21432012143 is a deficient number, since it is larger than the sum of its proper divisors (840697).

21432012143 is an equidigital number, since it uses as much as digits as its factorization.

21432012143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840696.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21432012143 its reverse (34121023412), we get a palindrome (55553035555).

The spelling of 21432012143 in words is "twenty-one billion, four hundred thirty-two million, twelve thousand, one hundred forty-three".