378021210221 has 2 divisors, whose sum is σ = 378021210222. Its totient is φ = 378021210220.

The previous prime is 378021210199. The next prime is 378021210241. The reversal of 378021210221 is 122012120873.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 231109986121 + 146911224100 = 480739^2 + 383290^2 .

It is a cyclic number.

It is not a de Polignac number, because 378021210221 - 2⁶ = 378021210157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (378021210241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189010605110 + 189010605111.

It is an arithmetic number, because the mean of its divisors is an integer number (189010605111).

Almost surely, 2^378021210221 is an apocalyptic number.

It is an amenable number.

378021210221 is a deficient number, since it is larger than the sum of its proper divisors (1).

378021210221 is an equidigital number, since it uses as much as digits as its factorization.

378021210221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 29.

The spelling of 378021210221 in words is "three hundred seventy-eight billion, twenty-one million, two hundred ten thousand, two hundred twenty-one".