201854735221 has 4 divisors (see below), whose sum is σ = 203021525772. Its totient is φ = 200687944672.

The previous prime is 201854735179. The next prime is 201854735231. The reversal of 201854735221 is 122537458102.

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 91876278321 + 109978456900 = 303111^2 + 331630^2 .

It is a cyclic number.

It is not a de Polignac number, because 201854735221 - 2¹⁹ = 201854210933 is a prime.

It is a super-2 number, since 2×201854735221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201854735231) 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, 583395016 + ... + 583395361.

It is an arithmetic number, because the mean of its divisors is an integer number (50755381443).

Almost surely, 2^201854735221 is an apocalyptic number.

It is an amenable number.

201854735221 is a deficient number, since it is larger than the sum of its proper divisors (1166790551).

201854735221 is a wasteful number, since it uses less digits than its factorization.

201854735221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1166790550.

The product of its (nonzero) digits is 134400, while the sum is 40.

The spelling of 201854735221 in words is "two hundred one billion, eight hundred fifty-four million, seven hundred thirty-five thousand, two hundred twenty-one".