2221156 has 24 divisors (see below), whose sum is σ = 4636800. Its totient is φ = 910272.

The previous prime is 2221129. The next prime is 2221159. The reversal of 2221156 is 6511222.

2221156 = 171² + 172² + ... + 226².

It is not an unprimeable number, because it can be changed into a prime (2221159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1081 + ... + 2368.

It is an arithmetic number, because the mean of its divisors is an integer number (193200).

2^2221156 is an apocalyptic number.

It is an amenable number.

2221156 is an abundant number, since it is smaller than the sum of its proper divisors (2415644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2221156 is a wasteful number, since it uses less digits than its factorization.

2221156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3483 (or 3481 counting only the distinct ones).

The product of its digits is 240, while the sum is 19.

The square root of 2221156 is about 1490.3543202876. The cubic root of 2221156 is about 130.4747141058.

Adding to 2221156 its reverse (6511222), we get a palindrome (8732378).

It can be divided in two parts, 222 and 1156, that added together give a triangular number (1378 = T₅₂).

The spelling of 2221156 in words is "two million, two hundred twenty-one thousand, one hundred fifty-six".