229570821 has 16 divisors (see below), whose sum is σ = 340475520. Its totient is φ = 152880480.

The previous prime is 229570813. The next prime is 229570823. The reversal of 229570821 is 128075922.

229570821 is a `hidden beast` number, since 2 + 2 + 9 + 570 + 82 + 1 = 666.

It is not a de Polignac number, because 229570821 - 2³ = 229570813 is a prime.

It is a super-2 number, since 2×229570821² = 105405523709228082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (229570823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23776 + ... + 32006.

It is an arithmetic number, because the mean of its divisors is an integer number (21279720).

Almost surely, 2^229570821 is an apocalyptic number.

It is an amenable number.

229570821 is a deficient number, since it is larger than the sum of its proper divisors (110904699).

229570821 is a wasteful number, since it uses less digits than its factorization.

229570821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9273 (or 9267 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 229570821 is about 15151.5946685489. The cubic root of 229570821 is about 612.3112363479.

The spelling of 229570821 in words is "two hundred twenty-nine million, five hundred seventy thousand, eight hundred twenty-one".