21103121323 has 8 divisors (see below), whose sum is σ = 21207900816. Its totient is φ = 20998387200.

The previous prime is 21103121317. The next prime is 21103121327. The reversal of 21103121323 is 32312130112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21103121323 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 21103121323.

It is not an unprimeable number, because it can be changed into a prime (21103121327) 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, 1281663 + ... + 1298023.

It is an arithmetic number, because the mean of its divisors is an integer number (2650987602).

Almost surely, 2^21103121323 is an apocalyptic number.

21103121323 is a deficient number, since it is larger than the sum of its proper divisors (104779493).

21103121323 is a wasteful number, since it uses less digits than its factorization.

21103121323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22685.

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

Adding to 21103121323 its reverse (32312130112), we get a palindrome (53415251435).

The spelling of 21103121323 in words is "twenty-one billion, one hundred three million, one hundred twenty-one thousand, three hundred twenty-three".