21333143123 has 16 divisors (see below), whose sum is σ = 21845376000. Its totient is φ = 20826458112.

The previous prime is 21333143099. The next prime is 21333143147. The reversal of 21333143123 is 32134133312.

It is an interprime number because it is at equal distance from previous prime (21333143099) and next prime (21333143147).

It is a cyclic number.

It is not a de Polignac number, because 21333143123 - 2¹⁶ = 21333077587 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21333143092 and 21333143101.

It is not an unprimeable number, because it can be changed into a prime (21333143023) 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, 5441558 + ... + 5445476.

It is an arithmetic number, because the mean of its divisors is an integer number (1365336000).

Almost surely, 2^21333143123 is an apocalyptic number.

21333143123 is a deficient number, since it is larger than the sum of its proper divisors (512232877).

21333143123 is a wasteful number, since it uses less digits than its factorization.

21333143123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4594.

The product of its digits is 3888, while the sum is 26.

Adding to 21333143123 its reverse (32134133312), we get a palindrome (53467276435).

The spelling of 21333143123 in words is "twenty-one billion, three hundred thirty-three million, one hundred forty-three thousand, one hundred twenty-three".