223000000021 has 2 divisors, whose sum is σ = 223000000022. Its totient is φ = 223000000020.

The previous prime is 223000000009. The next prime is 223000000043. The reversal of 223000000021 is 120000000322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149281776900 + 73718223121 = 386370^2 + 271511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-223000000021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222999999944 and 223000000007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223000000061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111500000010 + 111500000011.

It is an arithmetic number, because the mean of its divisors is an integer number (111500000011).

Almost surely, 2^223000000021 is an apocalyptic number.

It is an amenable number.

223000000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

223000000021 is an equidigital number, since it uses as much as digits as its factorization.

223000000021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 10.

Adding to 223000000021 its reverse (120000000322), we get a palindrome (343000000343).

The spelling of 223000000021 in words is "two hundred twenty-three billion, twenty-one", and thus it is an aban number.