21333244143 has 8 divisors (see below), whose sum is σ = 28868867968. Its totient is φ = 14009891544.

The previous prime is 21333244109. The next prime is 21333244147. The reversal of 21333244143 is 34144233312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21333244143 - 2²⁶ = 21266135279 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21333244143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21333244147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53067571 + ... + 53067972.

It is an arithmetic number, because the mean of its divisors is an integer number (3608608496).

Almost surely, 2^21333244143 is an apocalyptic number.

21333244143 is a deficient number, since it is larger than the sum of its proper divisors (7535623825).

21333244143 is a wasteful number, since it uses less digits than its factorization.

21333244143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106135613.

The product of its digits is 20736, while the sum is 30.

Adding to 21333244143 its reverse (34144233312), we get a palindrome (55477477455).

The spelling of 21333244143 in words is "twenty-one billion, three hundred thirty-three million, two hundred forty-four thousand, one hundred forty-three".