21010333123 has 8 divisors (see below), whose sum is σ = 22628970000. Its totient is φ = 19392047328.

The previous prime is 21010333121. The next prime is 21010333139. The reversal of 21010333123 is 32133301012.

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

It is a cyclic number.

It is not a de Polignac number, because 21010333123 - 2¹ = 21010333121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21010333123.

It is not an unprimeable number, because it can be changed into a prime (21010333121) 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, 43848 + ... + 209626.

It is an arithmetic number, because the mean of its divisors is an integer number (2828621250).

Almost surely, 2^21010333123 is an apocalyptic number.

21010333123 is a deficient number, since it is larger than the sum of its proper divisors (1618636877).

21010333123 is a wasteful number, since it uses less digits than its factorization.

21010333123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175541.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21010333123 its reverse (32133301012), we get a palindrome (53143634135).

The spelling of 21010333123 in words is "twenty-one billion, ten million, three hundred thirty-three thousand, one hundred twenty-three".