21304420143 has 16 divisors (see below), whose sum is σ = 29179476480. Its totient is φ = 13816309536.

The previous prime is 21304420141. The next prime is 21304420157. The reversal of 21304420143 is 34102440312.

It is not a de Polignac number, because 21304420143 - 2¹ = 21304420141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21304420141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 636246 + ... + 668892.

It is an arithmetic number, because the mean of its divisors is an integer number (1823717280).

Almost surely, 2^21304420143 is an apocalyptic number.

21304420143 is a deficient number, since it is larger than the sum of its proper divisors (7875056337).

21304420143 is a wasteful number, since it uses less digits than its factorization.

21304420143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38566.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21304420143 its reverse (34102440312), we get a palindrome (55406860455).

The spelling of 21304420143 in words is "twenty-one billion, three hundred four million, four hundred twenty thousand, one hundred forty-three".