21120331123 has 8 divisors (see below), whose sum is σ = 22363992000. Its totient is φ = 19876813440.

The previous prime is 21120331117. The next prime is 21120331151. The reversal of 21120331123 is 32113302112.

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

It is a de Polignac number, because none of the positive numbers 2^k-21120331123 is a prime.

It is a super-3 number, since 3×21120331123³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 21120331123.

It is not an unprimeable number, because it can be changed into a prime (21120331153) 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, 481878 + ... + 523876.

It is an arithmetic number, because the mean of its divisors is an integer number (2795499000).

Almost surely, 2^21120331123 is an apocalyptic number.

21120331123 is a deficient number, since it is larger than the sum of its proper divisors (1243660877).

21120331123 is a wasteful number, since it uses less digits than its factorization.

21120331123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71597.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21120331123 its reverse (32113302112), we get a palindrome (53233633235).

The spelling of 21120331123 in words is "twenty-one billion, one hundred twenty million, three hundred thirty-one thousand, one hundred twenty-three".