1221275 has 12 divisors (see below), whose sum is σ = 1652424. Its totient is φ = 888000.

The previous prime is 1221251. The next prime is 1221289. The reversal of 1221275 is 5721221.

It is not a de Polignac number, because 1221275 - 2⁸ = 1221019 is a prime.

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1946 + ... + 2495.

It is an arithmetic number, because the mean of its divisors is an integer number (137702).

2^1221275 is an apocalyptic number.

1221275 is a deficient number, since it is larger than the sum of its proper divisors (431149).

1221275 is a wasteful number, since it uses less digits than its factorization.

1221275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4462 (or 4457 counting only the distinct ones).

The product of its digits is 280, while the sum is 20.

The square root of 1221275 is about 1105.1131163822. The cubic root of 1221275 is about 106.8901834270.

Adding to 1221275 its reverse (5721221), we get a palindrome (6942496).

The spelling of 1221275 in words is "one million, two hundred twenty-one thousand, two hundred seventy-five".