21031130123 has 8 divisors (see below), whose sum is σ = 21334303680. Its totient is φ = 20728880640.

The previous prime is 21031130089. The next prime is 21031130177. The reversal of 21031130123 is 32103113012.

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 21031130123 - 2⁶ = 21031130059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21031135123) 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, 185108 + ... + 276273.

It is an arithmetic number, because the mean of its divisors is an integer number (2666787960).

Almost surely, 2^21031130123 is an apocalyptic number.

21031130123 is a deficient number, since it is larger than the sum of its proper divisors (303173557).

21031130123 is an equidigital number, since it uses as much as digits as its factorization.

21031130123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462037.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21031130123 its reverse (32103113012), we get a palindrome (53134243135).

It can be divided in two parts, 2103113012 and 3, that multiplied together give a palindrome (6309339036).

The spelling of 21031130123 in words is "twenty-one billion, thirty-one million, one hundred thirty thousand, one hundred twenty-three".