21431202143 has 6 divisors (see below), whose sum is σ = 23206568184. Its totient is φ = 19782647976.

The previous prime is 21431202139. The next prime is 21431202151. The reversal of 21431202143 is 34120213412.

It is not a de Polignac number, because 21431202143 - 2² = 21431202139 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 (21431202343) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 63405755 + ... + 63406092.

It is an arithmetic number, because the mean of its divisors is an integer number (3867761364).

Almost surely, 2^21431202143 is an apocalyptic number.

21431202143 is a deficient number, since it is larger than the sum of its proper divisors (1775366041).

21431202143 is a wasteful number, since it uses less digits than its factorization.

21431202143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126811873 (or 126811860 counting only the distinct ones).

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

Adding to 21431202143 its reverse (34120213412), we get a palindrome (55551415555).

The spelling of 21431202143 in words is "twenty-one billion, four hundred thirty-one million, two hundred two thousand, one hundred forty-three".