21001120101023 has 2 divisors, whose sum is σ = 21001120101024. Its totient is φ = 21001120101022.

The previous prime is 21001120101011. The next prime is 21001120101037. The reversal of 21001120101023 is 32010102110012.

It is an a-pointer prime, because the next prime (21001120101037) can be obtained adding 21001120101023 to its sum of digits (14).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21001120101023 - 2⁴ = 21001120101007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21001120100989 and 21001120101007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21001120101223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500560050511 + 10500560050512.

It is an arithmetic number, because the mean of its divisors is an integer number (10500560050512).

Almost surely, 2^{21001120101023} is an apocalyptic number.

21001120101023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001120101023 is an equidigital number, since it uses as much as digits as its factorization.

21001120101023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21001120101023 its reverse (32010102110012), we get a palindrome (53011222211035).

The spelling of 21001120101023 in words is "twenty-one trillion, one billion, one hundred twenty million, one hundred one thousand, twenty-three".