21001022203223 has 2 divisors, whose sum is σ = 21001022203224. Its totient is φ = 21001022203222.

The previous prime is 21001022203211. The next prime is 21001022203319. The reversal of 21001022203223 is 32230222010012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21001022203223 - 2¹⁸ = 21001021941079 is a prime.

It is a super-2 number, since 2×21001022203223² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21001022203195 and 21001022203204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21001022203823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500511101611 + 10500511101612.

It is an arithmetic number, because the mean of its divisors is an integer number (10500511101612).

Almost surely, 2^{21001022203223} is an apocalyptic number.

21001022203223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001022203223 is an equidigital number, since it uses as much as digits as its factorization.

21001022203223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21001022203223 its reverse (32230222010012), we get a palindrome (53231244213235).

The spelling of 21001022203223 in words is "twenty-one trillion, one billion, twenty-two million, two hundred three thousand, two hundred twenty-three".