2356221 has 32 divisors (see below), whose sum is σ = 3836160. Its totient is φ = 1257984.

The previous prime is 2356219. The next prime is 2356259. The reversal of 2356221 is 1226532.

It is not a de Polignac number, because 2356221 - 2¹ = 2356219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2356021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32241 + ... + 32313.

It is an arithmetic number, because the mean of its divisors is an integer number (119880).

2^2356221 is an apocalyptic number.

2356221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2356221 is a deficient number, since it is larger than the sum of its proper divisors (1479939).

2356221 is a wasteful number, since it uses less digits than its factorization.

2356221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165.

The product of its digits is 720, while the sum is 21.

The square root of 2356221 is about 1534.9986970679. The cubic root of 2356221 is about 133.0675029979.

The spelling of 2356221 in words is "two million, three hundred fifty-six thousand, two hundred twenty-one".