21202123103123 has 8 divisors (see below), whose sum is σ = 21561911002800. Its totient is φ = 20842349532928.

The previous prime is 21202123103093. The next prime is 21202123103237. The reversal of 21202123103123 is 32130132120212.

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 21202123103123 - 2¹⁸ = 21202122840979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21202123103023) 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, 576818 + ... + 6537351.

It is an arithmetic number, because the mean of its divisors is an integer number (2695238875350).

Almost surely, 2^{21202123103123} is an apocalyptic number.

21202123103123 is a deficient number, since it is larger than the sum of its proper divisors (359787899677).

21202123103123 is an equidigital number, since it uses as much as digits as its factorization.

21202123103123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7164741.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21202123103123 its reverse (32130132120212), we get a palindrome (53332255223335).

The spelling of 21202123103123 in words is "twenty-one trillion, two hundred two billion, one hundred twenty-three million, one hundred three thousand, one hundred twenty-three".