228355842021021 has 96 divisors (see below), whose sum is σ = 388898216074368. Its totient is φ = 127295100702720.

The previous prime is 228355842021011. The next prime is 228355842021023. The reversal of 228355842021021 is 120120248553822.

228355842021021 is a `hidden beast` number, since 2 + 2 + 8 + 3 + 5 + 5 + 8 + 420 + 210 + 2 + 1 = 666.

It is not a de Polignac number, because 228355842021021 - 2²³ = 228355833632413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228355842021023) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1270975825 + ... + 1271155481.

It is an arithmetic number, because the mean of its divisors is an integer number (4051023084108).

Almost surely, 2^{228355842021021} is an apocalyptic number.

It is an amenable number.

228355842021021 is a deficient number, since it is larger than the sum of its proper divisors (160542374053347).

228355842021021 is a wasteful number, since it uses less digits than its factorization.

228355842021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183211 (or 183208 counting only the distinct ones).

The product of its (nonzero) digits is 614400, while the sum is 45.

The spelling of 228355842021021 in words is "two hundred twenty-eight trillion, three hundred fifty-five billion, eight hundred forty-two million, twenty-one thousand, twenty-one".