228272121 has 64 divisors (see below), whose sum is σ = 429004800. Its totient is φ = 116510400.

The previous prime is 228272119. The next prime is 228272131. The reversal of 228272121 is 121272822.

It is not a de Polignac number, because 228272121 - 2¹ = 228272119 is a prime.

It is a super-2 number, since 2×228272121² = 104216322451677282, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (228272131) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 121731 + ... + 123591.

It is an arithmetic number, because the mean of its divisors is an integer number (6703200).

Almost surely, 2^228272121 is an apocalyptic number.

228272121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

228272121 is a deficient number, since it is larger than the sum of its proper divisors (200732679).

228272121 is a wasteful number, since it uses less digits than its factorization.

228272121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1947 (or 1941 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

The square root of 228272121 is about 15108.6770102481. The cubic root of 228272121 is about 611.1544214288.

The spelling of 228272121 in words is "two hundred twenty-eight million, two hundred seventy-two thousand, one hundred twenty-one".