901221 has 16 divisors (see below), whose sum is σ = 1306368. Its totient is φ = 550400.

The previous prime is 901213. The next prime is 901247. The reversal of 901221 is 122109.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 901221 - 2³ = 901213 is a prime.

It is an Ulam number.

901221 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 901221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (901211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1876 + ... + 2306.

It is an arithmetic number, because the mean of its divisors is an integer number (81648).

2⁹⁰¹²²¹ is an apocalyptic number.

It is an amenable number.

901221 is a deficient number, since it is larger than the sum of its proper divisors (405147).

901221 is a wasteful number, since it uses less digits than its factorization.

901221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 901221 is about 949.3266034406. The cubic root of 901221 is about 96.5925803062.

The spelling of 901221 in words is "nine hundred one thousand, two hundred twenty-one".