1221171 has 8 divisors (see below), whose sum is σ = 1860864. Its totient is φ = 697800.

The previous prime is 1221167. The next prime is 1221193. The reversal of 1221171 is 1711221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221171 - 2² = 1221167 is a prime.

It is a super-2 number, since 2×1221171² = 2982517222482, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221171.

It is not an unprimeable number, because it can be changed into a prime (1221131) 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, 29055 + ... + 29096.

It is an arithmetic number, because the mean of its divisors is an integer number (232608).

2^1221171 is an apocalyptic number.

1221171 is a deficient number, since it is larger than the sum of its proper divisors (639693).

1221171 is an equidigital number, since it uses as much as digits as its factorization.

1221171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58161.

The product of its digits is 28, while the sum is 15.

The square root of 1221171 is about 1105.0660613737. The cubic root of 1221171 is about 106.8871491951.

Adding to 1221171 its reverse (1711221), we get a palindrome (2932392).

The spelling of 1221171 in words is "one million, two hundred twenty-one thousand, one hundred seventy-one".