21221011101023 has 2 divisors, whose sum is σ = 21221011101024. Its totient is φ = 21221011101022.

The previous prime is 21221011100987. The next prime is 21221011101047. The reversal of 21221011101023 is 32010111012212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21221011101023 - 2¹⁰ = 21221011099999 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21221011100992 and 21221011101010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221011101083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610505550511 + 10610505550512.

It is an arithmetic number, because the mean of its divisors is an integer number (10610505550512).

Almost surely, 2^{21221011101023} is an apocalyptic number.

21221011101023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221011101023 is an equidigital number, since it uses as much as digits as its factorization.

21221011101023 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 17.

Adding to 21221011101023 its reverse (32010111012212), we get a palindrome (53231122113235).

The spelling of 21221011101023 in words is "twenty-one trillion, two hundred twenty-one billion, eleven million, one hundred one thousand, twenty-three".