228653021 has 4 divisors (see below), whose sum is σ = 228811200. Its totient is φ = 228494844.

The previous prime is 228653017. The next prime is 228653027. The reversal of 228653021 is 120356822.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120356822 = 2 ⋅60178411.

It is a cyclic number.

It is not a de Polignac number, because 228653021 - 2² = 228653017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228653027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76901 + ... + 79818.

It is an arithmetic number, because the mean of its divisors is an integer number (57202800).

Almost surely, 2^228653021 is an apocalyptic number.

It is an amenable number.

228653021 is a deficient number, since it is larger than the sum of its proper divisors (158179).

228653021 is a wasteful number, since it uses less digits than its factorization.

228653021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158178.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 228653021 is about 15121.2770955366. The cubic root of 228653021 is about 611.4941612083.

The spelling of 228653021 in words is "two hundred twenty-eight million, six hundred fifty-three thousand, twenty-one".