223403111021 has 2 divisors, whose sum is σ = 223403111022. Its totient is φ = 223403111020.

The previous prime is 223403110993. The next prime is 223403111023. The reversal of 223403111021 is 120111304322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185489569225 + 37913541796 = 430685^2 + 194714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-223403111021 is a prime.

It is a super-2 number, since 2×223403111021² (a number of 23 digits) contains 22 as substring.

Together with 223403111023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 223403110984 and 223403111002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223403111023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111701555510 + 111701555511.

It is an arithmetic number, because the mean of its divisors is an integer number (111701555511).

Almost surely, 2^223403111021 is an apocalyptic number.

It is an amenable number.

223403111021 is a deficient number, since it is larger than the sum of its proper divisors (1).

223403111021 is an equidigital number, since it uses as much as digits as its factorization.

223403111021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 223403111021 its reverse (120111304322), we get a palindrome (343514415343).

The spelling of 223403111021 in words is "two hundred twenty-three billion, four hundred three million, one hundred eleven thousand, twenty-one".