228121737120 has 72 divisors (see below), whose sum is σ = 778465432836. Its totient is φ = 60832462848.

The previous prime is 228121737101. The next prime is 228121737157. The reversal of 228121737120 is 21737121822.

It is a happy number.

228121737120 is a `hidden beast` number, since 2 + 281 + 2 + 1 + 7 + 371 + 2 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 205089425424 + 23032311696 = 452868^2 + 151764^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79207497 + ... + 79210376.

Almost surely, 2^228121737120 is an apocalyptic number.

228121737120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228121737120 is an abundant number, since it is smaller than the sum of its proper divisors (550343695716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

228121737120 is a wasteful number, since it uses less digits than its factorization.

228121737120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158417894 (or 158417883 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

Adding to 228121737120 its reverse (21737121822), we get a palindrome (249858858942).

The spelling of 228121737120 in words is "two hundred twenty-eight billion, one hundred twenty-one million, seven hundred thirty-seven thousand, one hundred twenty".