228023021 has 2 divisors, whose sum is σ = 228023022. Its totient is φ = 228023020.

The previous prime is 228022999. The next prime is 228023051. The reversal of 228023021 is 120320822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130210921 + 97812100 = 11411^2 + 9890^2 .

It is a cyclic number.

It is not a de Polignac number, because 228023021 - 2⁶ = 228022957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 228022984 and 228023002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228023051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114011510 + 114011511.

It is an arithmetic number, because the mean of its divisors is an integer number (114011511).

Almost surely, 2^228023021 is an apocalyptic number.

It is an amenable number.

228023021 is a deficient number, since it is larger than the sum of its proper divisors (1).

228023021 is an equidigital number, since it uses as much as digits as its factorization.

228023021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 228023021 is about 15100.4311527850. The cubic root of 228023021 is about 610.9320348379.

Adding to 228023021 its reverse (120320822), we get a palindrome (348343843).

The spelling of 228023021 in words is "two hundred twenty-eight million, twenty-three thousand, twenty-one".