1221011 has 6 divisors (see below), whose sum is σ = 1342236. Its totient is φ = 1109900.

The previous prime is 1220993. The next prime is 1221019. The reversal of 1221011 is 1101221.

1221011 = 225² + 226² + ... + 246².

It is a de Polignac number, because none of the positive numbers 2^k-1221011 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a nialpdrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 1221011.

It is not an unprimeable number, because it can be changed into a prime (1221019) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4925 + ... + 5166.

It is an arithmetic number, because the mean of its divisors is an integer number (223706).

2^1221011 is an apocalyptic number.

1221011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1221011 is a deficient number, since it is larger than the sum of its proper divisors (121225).

1221011 is a wasteful number, since it uses less digits than its factorization.

1221011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10113 (or 10102 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1221011 is about 1104.9936651402. The cubic root of 1221011 is about 106.8824808096.

Adding to 1221011 its reverse (1101221), we get a palindrome (2322232).

It can be divided in two parts, 12210 and 11, that added together give a palindrome (12221).

The spelling of 1221011 in words is "one million, two hundred twenty-one thousand, eleven".