1221106 has 4 divisors (see below), whose sum is σ = 1831662. Its totient is φ = 610552.

The previous prime is 1221097. The next prime is 1221113. The reversal of 1221106 is 6011221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1221025 + 81 = 1105^2 + 9^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305275 + ... + 305278.

2^1221106 is an apocalyptic number.

1221106 is a deficient number, since it is larger than the sum of its proper divisors (610556).

1221106 is an equidigital number, since it uses as much as digits as its factorization.

1221106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610555.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1221106 is about 1105.0366509759. The cubic root of 1221106 is about 106.8852527127.

Adding to 1221106 its reverse (6011221), we get a palindrome (7232327).

The spelling of 1221106 in words is "one million, two hundred twenty-one thousand, one hundred six".