228836421 has 20 divisors (see below), whose sum is σ = 372920064. Its totient is φ = 138688200.

The previous prime is 228836393. The next prime is 228836441. The reversal of 228836421 is 124638822.

228836421 is a `hidden beast` number, since 2 + 2 + 8 + 8 + 3 + 642 + 1 = 666.

It is not a de Polignac number, because 228836421 - 2¹⁴ = 228820037 is a prime.

It is a super-2 number, since 2×228836421² = 104732215152178482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228836441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 127525 + ... + 129306.

Almost surely, 2^228836421 is an apocalyptic number.

It is an amenable number.

228836421 is a deficient number, since it is larger than the sum of its proper divisors (144083643).

228836421 is a wasteful number, since it uses less digits than its factorization.

228836421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256854 (or 256845 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 228836421 is about 15127.3401825965. The cubic root of 228836421 is about 611.6576083648.

The spelling of 228836421 in words is "two hundred twenty-eight million, eight hundred thirty-six thousand, four hundred twenty-one".