1221707 has 2 divisors, whose sum is σ = 1221708. Its totient is φ = 1221706.

The previous prime is 1221667. The next prime is 1221749. The reversal of 1221707 is 7071221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221707 - 2¹⁶ = 1156171 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1221767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610853 + 610854.

It is an arithmetic number, because the mean of its divisors is an integer number (610854).

2^1221707 is an apocalyptic number.

1221707 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221707 is an equidigital number, since it uses as much as digits as its factorization.

1221707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 196, while the sum is 20.

The square root of 1221707 is about 1105.3085542056. The cubic root of 1221707 is about 106.9027853159.

Adding to 1221707 its reverse (7071221), we get a palindrome (8292928).

The spelling of 1221707 in words is "one million, two hundred twenty-one thousand, seven hundred seven".