388214882221 has 4 divisors (see below), whose sum is σ = 388223427772. Its totient is φ = 388206336672.

The previous prime is 388214882177. The next prime is 388214882249. The reversal of 388214882221 is 122288412883.

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 147736453225 + 240478428996 = 384365^2 + 490386^2 .

It is a cyclic number.

It is not a de Polignac number, because 388214882221 - 2³⁵ = 353855143853 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 (388214882261) 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, 4204266 + ... + 4295611.

It is an arithmetic number, because the mean of its divisors is an integer number (97055856943).

Almost surely, 2^388214882221 is an apocalyptic number.

It is an amenable number.

388214882221 is a deficient number, since it is larger than the sum of its proper divisors (8545551).

388214882221 is an equidigital number, since it uses as much as digits as its factorization.

388214882221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8545550.

The product of its digits is 786432, while the sum is 49.

The spelling of 388214882221 in words is "three hundred eighty-eight billion, two hundred fourteen million, eight hundred eighty-two thousand, two hundred twenty-one".