21000230143 has 8 divisors (see below), whose sum is σ = 21986118000. Its totient is φ = 20031791808.

The previous prime is 21000230123. The next prime is 21000230177. The reversal of 21000230143 is 34103200012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21000230143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000230113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4359918 + ... + 4364731.

It is an arithmetic number, because the mean of its divisors is an integer number (2748264750).

Almost surely, 2^21000230143 is an apocalyptic number.

21000230143 is a deficient number, since it is larger than the sum of its proper divisors (985887857).

21000230143 is an equidigital number, since it uses as much as digits as its factorization.

21000230143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8724761.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21000230143 its reverse (34103200012), we get a palindrome (55103430155).

The spelling of 21000230143 in words is "twenty-one billion, two hundred thirty thousand, one hundred forty-three".