1838214221 has 2 divisors, whose sum is σ = 1838214222. Its totient is φ = 1838214220.

The previous prime is 1838214193. The next prime is 1838214229. The reversal of 1838214221 is 1224128381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1833038596 + 5175625 = 42814^2 + 2275^2 .

It is a cyclic number.

It is not a de Polignac number, because 1838214221 - 2²² = 1834019917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1838214229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 919107110 + 919107111.

It is an arithmetic number, because the mean of its divisors is an integer number (919107111).

Almost surely, 2^1838214221 is an apocalyptic number.

It is an amenable number.

1838214221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1838214221 is an equidigital number, since it uses as much as digits as its factorization.

1838214221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6144, while the sum is 32.

The square root of 1838214221 is about 42874.4005322523. The cubic root of 1838214221 is about 1224.9885815401.

The spelling of 1838214221 in words is "one billion, eight hundred thirty-eight million, two hundred fourteen thousand, two hundred twenty-one".