1221275077 has 12 divisors (see below), whose sum is σ = 1365608448. Its totient is φ = 1083154400.

The previous prime is 1221275059. The next prime is 1221275089. The reversal of 1221275077 is 7705721221.

It is not a de Polignac number, because 1221275077 - 2¹¹ = 1221273029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221272077) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14533 + ... + 51514.

It is an arithmetic number, because the mean of its divisors is an integer number (113800704).

Almost surely, 2^1221275077 is an apocalyptic number.

It is an amenable number.

1221275077 is a deficient number, since it is larger than the sum of its proper divisors (144333371).

1221275077 is an equidigital number, since it uses as much as digits as its factorization.

1221275077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66140 (or 66099 counting only the distinct ones).

The product of its (nonzero) digits is 13720, while the sum is 34.

The square root of 1221275077 is about 34946.7463006215. The cubic root of 1221275077 is about 1068.9018567343.

Adding to 1221275077 its reverse (7705721221), we get a palindrome (8926996298).

The spelling of 1221275077 in words is "one billion, two hundred twenty-one million, two hundred seventy-five thousand, seventy-seven".