21211003030123 has 2 divisors, whose sum is σ = 21211003030124. Its totient is φ = 21211003030122.

The previous prime is 21211003030099. The next prime is 21211003030163. The reversal of 21211003030123 is 32103030011212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21211003030123 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21211003030123.

It is not a weakly prime, because it can be changed into another prime (21211003030163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605501515061 + 10605501515062.

It is an arithmetic number, because the mean of its divisors is an integer number (10605501515062).

Almost surely, 2^{21211003030123} is an apocalyptic number.

21211003030123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211003030123 is an equidigital number, since it uses as much as digits as its factorization.

21211003030123 is an evil number, because the sum of its binary digits is even.

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

Adding to 21211003030123 its reverse (32103030011212), we get a palindrome (53314033041335).

The spelling of 21211003030123 in words is "twenty-one trillion, two hundred eleven billion, three million, thirty thousand, one hundred twenty-three".