1816150221 has 16 divisors (see below), whose sum is σ = 2777387520. Its totient is φ = 1171709280.

The previous prime is 1816150211. The next prime is 1816150229. The reversal of 1816150221 is 1220516181.

1816150221 is a `hidden beast` number, since 1 + 81 + 61 + 502 + 21 = 666.

It is not a de Polignac number, because 1816150221 - 2¹⁰ = 1816149197 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1816150229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1084080 + ... + 1085753.

It is an arithmetic number, because the mean of its divisors is an integer number (173586720).

Almost surely, 2^1816150221 is an apocalyptic number.

It is an amenable number.

1816150221 is a deficient number, since it is larger than the sum of its proper divisors (961237299).

1816150221 is a wasteful number, since it uses less digits than its factorization.

1816150221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2169873 (or 2169867 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 27.

The square root of 1816150221 is about 42616.3140240918. The cubic root of 1816150221 is about 1220.0676798878.

The spelling of 1816150221 in words is "one billion, eight hundred sixteen million, one hundred fifty thousand, two hundred twenty-one".