21033301143 has 4 divisors (see below), whose sum is σ = 28044401528. Its totient is φ = 14022200760.

The previous prime is 21033301141. The next prime is 21033301189. The reversal of 21033301143 is 34110333012.

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

It is not a de Polignac number, because 21033301143 - 2¹ = 21033301141 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 (21033301141) 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, 3505550188 + ... + 3505550193.

It is an arithmetic number, because the mean of its divisors is an integer number (7011100382).

Almost surely, 2^21033301143 is an apocalyptic number.

21033301143 is a deficient number, since it is larger than the sum of its proper divisors (7011100385).

21033301143 is an equidigital number, since it uses as much as digits as its factorization.

21033301143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7011100384.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21033301143 its reverse (34110333012), we get a palindrome (55143634155).

The spelling of 21033301143 in words is "twenty-one billion, thirty-three million, three hundred one thousand, one hundred forty-three".