229135021 has 2 divisors, whose sum is σ = 229135022. Its totient is φ = 229135020.

The previous prime is 229135001. The next prime is 229135033. The reversal of 229135021 is 120531922.

It is a happy number.

229135021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184579396 + 44555625 = 13586^2 + 6675^2 .

It is a cyclic number.

It is not a de Polignac number, because 229135021 - 2²³ = 220746413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (229135001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114567510 + 114567511.

It is an arithmetic number, because the mean of its divisors is an integer number (114567511).

Almost surely, 2^229135021 is an apocalyptic number.

It is an amenable number.

229135021 is a deficient number, since it is larger than the sum of its proper divisors (1).

229135021 is an equidigital number, since it uses as much as digits as its factorization.

229135021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 229135021 is about 15137.2065124315. The cubic root of 229135021 is about 611.9235357001.

Adding to 229135021 its reverse (120531922), we get a palindrome (349666943).

The spelling of 229135021 in words is "two hundred twenty-nine million, one hundred thirty-five thousand, twenty-one".