21435302143 has 4 divisors (see below), whose sum is σ = 22563475960. Its totient is φ = 20307128328.

The previous prime is 21435302137. The next prime is 21435302171. The reversal of 21435302143 is 34120353412.

It is a happy number.

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 21435302143 - 2⁹ = 21435301631 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 (21435306143) 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, 564086880 + ... + 564086917.

It is an arithmetic number, because the mean of its divisors is an integer number (5640868990).

Almost surely, 2^21435302143 is an apocalyptic number.

21435302143 is a deficient number, since it is larger than the sum of its proper divisors (1128173817).

21435302143 is a wasteful number, since it uses less digits than its factorization.

21435302143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128173816.

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 21435302143 its reverse (34120353412), we get a palindrome (55555655555).

The spelling of 21435302143 in words is "twenty-one billion, four hundred thirty-five million, three hundred two thousand, one hundred forty-three".