21333210123 has 8 divisors (see below), whose sum is σ = 28546968208. Its totient is φ = 14170796064.

The previous prime is 21333210061. The next prime is 21333210131. The reversal of 21333210123 is 32101233312.

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

It is not a de Polignac number, because 21333210123 - 2²⁰ = 21332161547 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 21333210123.

It is not an unprimeable number, because it can be changed into a prime (21333210193) 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, 12835036 + ... + 12836697.

It is an arithmetic number, because the mean of its divisors is an integer number (3568371026).

Almost surely, 2^21333210123 is an apocalyptic number.

21333210123 is a deficient number, since it is larger than the sum of its proper divisors (7213758085).

21333210123 is a wasteful number, since it uses less digits than its factorization.

21333210123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25672013.

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

Adding to 21333210123 its reverse (32101233312), we get a palindrome (53434443435).

The spelling of 21333210123 in words is "twenty-one billion, three hundred thirty-three million, two hundred ten thousand, one hundred twenty-three".