223240120021 has 2 divisors, whose sum is σ = 223240120022. Its totient is φ = 223240120020.

The previous prime is 223240120013. The next prime is 223240120027. The reversal of 223240120021 is 120021042322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208346602500 + 14893517521 = 456450^2 + 122039^2 .

It is a cyclic number.

It is not a de Polignac number, because 223240120021 - 2³ = 223240120013 is a prime.

It is a super-3 number, since 3×223240120021³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223240120027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111620060010 + 111620060011.

It is an arithmetic number, because the mean of its divisors is an integer number (111620060011).

Almost surely, 2^223240120021 is an apocalyptic number.

It is an amenable number.

223240120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

223240120021 is an equidigital number, since it uses as much as digits as its factorization.

223240120021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 223240120021 its reverse (120021042322), we get a palindrome (343261162343).

The spelling of 223240120021 in words is "two hundred twenty-three billion, two hundred forty million, one hundred twenty thousand, twenty-one".