21222001030123 has 4 divisors (see below), whose sum is σ = 21222033734880. Its totient is φ = 21221968325368.

The previous prime is 21222001030099. The next prime is 21222001030193. The reversal of 21222001030123 is 32103010022212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21222001030123 - 2¹⁷ = 21222000899051 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 21222001030123.

It is not an unprimeable number, because it can be changed into a prime (21222001030193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15358915 + ... + 16683532.

It is an arithmetic number, because the mean of its divisors is an integer number (5305508433720).

Almost surely, 2^{21222001030123} is an apocalyptic number.

21222001030123 is a deficient number, since it is larger than the sum of its proper divisors (32704757).

21222001030123 is an equidigital number, since it uses as much as digits as its factorization.

21222001030123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32704756.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21222001030123 its reverse (32103010022212), we get a palindrome (53325011052335).

The spelling of 21222001030123 in words is "twenty-one trillion, two hundred twenty-two billion, one million, thirty thousand, one hundred twenty-three".