21033212143 has 4 divisors (see below), whose sum is σ = 21083411160. Its totient is φ = 20983013128.

The previous prime is 21033212119. The next prime is 21033212197. The reversal of 21033212143 is 34121233012.

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

It is a cyclic number.

It is not a de Polignac number, because 21033212143 - 2²⁹ = 20496341231 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 (21033219143) 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, 25098880 + ... + 25099717.

It is an arithmetic number, because the mean of its divisors is an integer number (5270852790).

Almost surely, 2^21033212143 is an apocalyptic number.

21033212143 is a deficient number, since it is larger than the sum of its proper divisors (50199017).

21033212143 is an equidigital number, since it uses as much as digits as its factorization.

21033212143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50199016.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21033212143 its reverse (34121233012), we get a palindrome (55154445155).

The spelling of 21033212143 in words is "twenty-one billion, thirty-three million, two hundred twelve thousand, one hundred forty-three".