1221007 has 4 divisors (see below), whose sum is σ = 1226016. Its totient is φ = 1216000.

The previous prime is 1220993. The next prime is 1221019. The reversal of 1221007 is 7001221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221007 - 2¹⁹ = 696719 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221097) 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, 2119 + ... + 2632.

It is an arithmetic number, because the mean of its divisors is an integer number (306504).

2^1221007 is an apocalyptic number.

1221007 is a deficient number, since it is larger than the sum of its proper divisors (5009).

1221007 is an equidigital number, since it uses as much as digits as its factorization.

1221007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5008.

The product of its (nonzero) digits is 28, while the sum is 13.

The square root of 1221007 is about 1104.9918551736. The cubic root of 1221007 is about 106.8823640948.

Adding to 1221007 its reverse (7001221), we get a palindrome (8222228).

The spelling of 1221007 in words is "one million, two hundred twenty-one thousand, seven".