1221013 has 8 divisors (see below), whose sum is σ = 1266048. Its totient is φ = 1176864.

The previous prime is 1220993. The next prime is 1221019. The reversal of 1221013 is 3101221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221013 - 2⁵ = 1220981 is a prime.

It is a Duffinian number.

1221013 is a lucky number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 3745 + ... + 4057.

It is an arithmetic number, because the mean of its divisors is an integer number (158256).

2^1221013 is an apocalyptic number.

It is an amenable number.

1221013 is a deficient number, since it is larger than the sum of its proper divisors (45035).

1221013 is an equidigital number, since it uses as much as digits as its factorization.

1221013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1221013 is about 1104.9945701224. The cubic root of 1221013 is about 106.8825391670.

Adding to 1221013 its product of nonzero digits (12), we get a square (1221025 = 1105²).

Adding to 1221013 its reverse (3101221), we get a palindrome (4322234).

It can be divided in two parts, 12 and 21013, that added together give a square (21025 = 145²).

The spelling of 1221013 in words is "one million, two hundred twenty-one thousand, thirteen".