223033220021 has 2 divisors, whose sum is σ = 223033220022. Its totient is φ = 223033220020.

The previous prime is 223033219999. The next prime is 223033220041. The reversal of 223033220021 is 120022330322.

It is an a-pointer prime, because the next prime (223033220041) can be obtained adding 223033220021 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 219572839396 + 3460380625 = 468586^2 + 58825^2 .

It is a cyclic number.

It is not a de Polignac number, because 223033220021 - 2⁶ = 223033219957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 223033219975 and 223033220002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223033220041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111516610010 + 111516610011.

It is an arithmetic number, because the mean of its divisors is an integer number (111516610011).

Almost surely, 2^223033220021 is an apocalyptic number.

It is an amenable number.

223033220021 is a deficient number, since it is larger than the sum of its proper divisors (1).

223033220021 is an equidigital number, since it uses as much as digits as its factorization.

223033220021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 223033220021 its reverse (120022330322), we get a palindrome (343055550343).

The spelling of 223033220021 in words is "two hundred twenty-three billion, thirty-three million, two hundred twenty thousand, twenty-one".