35866221 has 4 divisors (see below), whose sum is σ = 47821632. Its totient is φ = 23910812.

The previous prime is 35866157. The next prime is 35866241. The reversal of 35866221 is 12266853.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 35866221 - 2⁶ = 35866157 is a prime.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (35866241) 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, 5977701 + ... + 5977706.

It is an arithmetic number, because the mean of its divisors is an integer number (11955408).

Almost surely, 2^35866221 is an apocalyptic number.

It is an amenable number.

35866221 is a deficient number, since it is larger than the sum of its proper divisors (11955411).

35866221 is a wasteful number, since it uses less digits than its factorization.

35866221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11955410.

The product of its digits is 17280, while the sum is 33.

The square root of 35866221 is about 5988.8413737550. The cubic root of 35866221 is about 329.7832093112.

The spelling of 35866221 in words is "thirty-five million, eight hundred sixty-six thousand, two hundred twenty-one".