227888821 has 4 divisors (see below), whose sum is σ = 228031200. Its totient is φ = 227746444.

The previous prime is 227888819. The next prime is 227888827. The reversal of 227888821 is 128888722.

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: 128888722 = 2 ⋅64444361.

It is a cyclic number.

It is not a de Polignac number, because 227888821 - 2¹ = 227888819 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 (227888827) 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, 68761 + ... + 71998.

It is an arithmetic number, because the mean of its divisors is an integer number (57007800).

Almost surely, 2^227888821 is an apocalyptic number.

It is an amenable number.

227888821 is a deficient number, since it is larger than the sum of its proper divisors (142379).

227888821 is a wasteful number, since it uses less digits than its factorization.

227888821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142378.

The product of its digits is 229376, while the sum is 46.

The square root of 227888821 is about 15095.9869170585. The cubic root of 227888821 is about 610.8121592685.

Subtracting from 227888821 its reverse (128888722), we obtain a palindrome (99000099).

The spelling of 227888821 in words is "two hundred twenty-seven million, eight hundred eighty-eight thousand, eight hundred twenty-one".