228647537021 has 4 divisors (see below), whose sum is σ = 228649898844. Its totient is φ = 228645175200.

The previous prime is 228647536981. The next prime is 228647537039. The reversal of 228647537021 is 120735746822.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 135004804900 + 93642732121 = 367430^2 + 306011^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228647537021 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 (228647537221) 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, 1029200 + ... + 1231481.

It is an arithmetic number, because the mean of its divisors is an integer number (57162474711).

Almost surely, 2^228647537021 is an apocalyptic number.

It is an amenable number.

228647537021 is a deficient number, since it is larger than the sum of its proper divisors (2361823).

228647537021 is a wasteful number, since it uses less digits than its factorization.

228647537021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2361822.

The product of its (nonzero) digits is 1128960, while the sum is 47.

The spelling of 228647537021 in words is "two hundred twenty-eight billion, six hundred forty-seven million, five hundred thirty-seven thousand, twenty-one".