228190545421 has 2 divisors, whose sum is σ = 228190545422. Its totient is φ = 228190545420.

The previous prime is 228190545377. The next prime is 228190545439. The reversal of 228190545421 is 124545091822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216726560521 + 11463984900 = 465539^2 + 107070^2 .

It is a cyclic number.

It is not a de Polignac number, because 228190545421 - 2⁷ = 228190545293 is a prime.

It is a super-3 number, since 3×228190545421³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228190545521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114095272710 + 114095272711.

It is an arithmetic number, because the mean of its divisors is an integer number (114095272711).

Almost surely, 2^228190545421 is an apocalyptic number.

It is an amenable number.

228190545421 is a deficient number, since it is larger than the sum of its proper divisors (1).

228190545421 is an equidigital number, since it uses as much as digits as its factorization.

228190545421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 230400, while the sum is 43.

The spelling of 228190545421 in words is "two hundred twenty-eight billion, one hundred ninety million, five hundred forty-five thousand, four hundred twenty-one".