229622821 has 2 divisors, whose sum is σ = 229622822. Its totient is φ = 229622820.

The previous prime is 229622713. The next prime is 229622843. The reversal of 229622821 is 128226922.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221861025 + 7761796 = 14895^2 + 2786^2 .

It is a cyclic number.

It is not a de Polignac number, because 229622821 - 2¹³ = 229614629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (229625821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114811410 + 114811411.

It is an arithmetic number, because the mean of its divisors is an integer number (114811411).

Almost surely, 2^229622821 is an apocalyptic number.

It is an amenable number.

229622821 is a deficient number, since it is larger than the sum of its proper divisors (1).

229622821 is an equidigital number, since it uses as much as digits as its factorization.

229622821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 34.

The square root of 229622821 is about 15153.3105623821. The cubic root of 229622821 is about 612.3574643201.

The spelling of 229622821 in words is "two hundred twenty-nine million, six hundred twenty-two thousand, eight hundred twenty-one".