21001120101223 has 2 divisors, whose sum is σ = 21001120101224. Its totient is φ = 21001120101222.

The previous prime is 21001120101193. The next prime is 21001120101233. The reversal of 21001120101223 is 32210102110012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21001120101223 - 2²⁹ = 21000583230311 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21001120101197 and 21001120101206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21001120101233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500560050611 + 10500560050612.

It is an arithmetic number, because the mean of its divisors is an integer number (10500560050612).

Almost surely, 2^{21001120101223} is an apocalyptic number.

21001120101223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001120101223 is an equidigital number, since it uses as much as digits as its factorization.

21001120101223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21001120101223 its reverse (32210102110012), we get a palindrome (53211222211235).

The spelling of 21001120101223 in words is "twenty-one trillion, one billion, one hundred twenty million, one hundred one thousand, two hundred twenty-three".