1221207 has 16 divisors (see below), whose sum is σ = 1773408. Its totient is φ = 743040.

The previous prime is 1221197. The next prime is 1221221. The reversal of 1221207 is 7021221.

It is not a de Polignac number, because 1221207 - 2⁷ = 1221079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6657 + ... + 6837.

It is an arithmetic number, because the mean of its divisors is an integer number (110838).

2^1221207 is an apocalyptic number.

1221207 is a deficient number, since it is larger than the sum of its proper divisors (552201).

1221207 is a wasteful number, since it uses less digits than its factorization.

1221207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370.

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 1221207 is about 1105.0823498726. The cubic root of 1221207 is about 106.8881995256. Note that the first 3 decimals are identical.

Adding to 1221207 its reverse (7021221), we get a palindrome (8242428).

The spelling of 1221207 in words is "one million, two hundred twenty-one thousand, two hundred seven".