1830218121 has 6 divisors (see below), whose sum is σ = 2643648410. Its totient is φ = 1220145408.

The previous prime is 1830218119. The next prime is 1830218129. The reversal of 1830218121 is 1218120381.

It can be written as a sum of positive squares in only one way, i.e., 1250612496 + 579605625 = 35364^2 + 24075^2 .

It is not a de Polignac number, because 1830218121 - 2¹ = 1830218119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1830218129) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 101678776 + ... + 101678793.

Almost surely, 2^1830218121 is an apocalyptic number.

It is an amenable number.

1830218121 is a deficient number, since it is larger than the sum of its proper divisors (813430289).

1830218121 is a wasteful number, since it uses less digits than its factorization.

1830218121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203357575 (or 203357572 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 1830218121 is about 42781.0486196867. The cubic root of 1830218121 is about 1223.2097956922.

The spelling of 1830218121 in words is "one billion, eight hundred thirty million, two hundred eighteen thousand, one hundred twenty-one".