21303520143 has 16 divisors (see below), whose sum is σ = 29364926976. Its totient is φ = 13729040640.

The previous prime is 21303520099. The next prime is 21303520153. The reversal of 21303520143 is 34102530312.

It is not a de Polignac number, because 21303520143 - 2⁶ = 21303520079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21303520153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 838743 + ... + 863768.

It is an arithmetic number, because the mean of its divisors is an integer number (1835307936).

Almost surely, 2^21303520143 is an apocalyptic number.

21303520143 is a deficient number, since it is larger than the sum of its proper divisors (8061406833).

21303520143 is a wasteful number, since it uses less digits than its factorization.

21303520143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1702654.

The product of its (nonzero) digits is 2160, while the sum is 24.

The spelling of 21303520143 in words is "twenty-one billion, three hundred three million, five hundred twenty thousand, one hundred forty-three".