228067921 has 2 divisors, whose sum is σ = 228067922. Its totient is φ = 228067920.

The previous prime is 228067877. The next prime is 228067967. The reversal of 228067921 is 129760822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161417025 + 66650896 = 12705^2 + 8164^2 .

It is a cyclic number.

It is not a de Polignac number, because 228067921 - 2²⁷ = 93850193 is a prime.

It is not a weakly prime, because it can be changed into another prime (228067991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114033960 + 114033961.

It is an arithmetic number, because the mean of its divisors is an integer number (114033961).

Almost surely, 2^228067921 is an apocalyptic number.

It is an amenable number.

228067921 is a deficient number, since it is larger than the sum of its proper divisors (1).

228067921 is an equidigital number, since it uses as much as digits as its factorization.

228067921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 228067921 is about 15101.9177921216. The cubic root of 228067921 is about 610.9721317369.

The spelling of 228067921 in words is "two hundred twenty-eight million, sixty-seven thousand, nine hundred twenty-one".