912005221 has 4 divisors (see below), whose sum is σ = 912236832. Its totient is φ = 911773612.

The previous prime is 912005219. The next prime is 912005233. The reversal of 912005221 is 122500219.

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 912005221 - 2¹ = 912005219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 912005192 and 912005201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (912005201) 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, 109795 + ... + 117808.

It is an arithmetic number, because the mean of its divisors is an integer number (228059208).

Almost surely, 2^912005221 is an apocalyptic number.

It is an amenable number.

912005221 is a deficient number, since it is larger than the sum of its proper divisors (231611).

912005221 is a wasteful number, since it uses less digits than its factorization.

912005221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231610.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 912005221 is about 30199.4241832522. The cubic root of 912005221 is about 969.7633677218.

The spelling of 912005221 in words is "nine hundred twelve million, five thousand, two hundred twenty-one".