21420310143 has 4 divisors (see below), whose sum is σ = 28560413528. Its totient is φ = 14280206760.

The previous prime is 21420310133. The next prime is 21420310151. The reversal of 21420310143 is 34101302412.

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

It is not a de Polignac number, because 21420310143 - 2²² = 21416115839 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 (21420310103) 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, 3570051688 + ... + 3570051693.

It is an arithmetic number, because the mean of its divisors is an integer number (7140103382).

Almost surely, 2^21420310143 is an apocalyptic number.

21420310143 is a deficient number, since it is larger than the sum of its proper divisors (7140103385).

21420310143 is an equidigital number, since it uses as much as digits as its factorization.

21420310143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7140103384.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21420310143 its reverse (34101302412), we get a palindrome (55521612555).

The spelling of 21420310143 in words is "twenty-one billion, four hundred twenty million, three hundred ten thousand, one hundred forty-three".