1221026 has 8 divisors (see below), whose sum is σ = 1842204. Its totient is φ = 606960.

The previous prime is 1221019. The next prime is 1221029. The reversal of 1221026 is 6201221.

It is a Cunningham number, because it is equal to 1105²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 1221025 + 1 = 1105^2 + 1^2 .

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

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221026.

It is not an unprimeable number, because it can be changed into a prime (1221029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1325 + ... + 2048.

2^1221026 is an apocalyptic number.

1221026 is a deficient number, since it is larger than the sum of its proper divisors (621178).

1221026 is a wasteful number, since it uses less digits than its factorization.

1221026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3556.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1221026 is about 1105.0004524886. Note that the first 3 decimals coincide. The cubic root of 1221026 is about 106.8829184881.

Adding to 1221026 its reverse (6201221), we get a palindrome (7422247).

The spelling of 1221026 in words is "one million, two hundred twenty-one thousand, twenty-six".