1221356 has 6 divisors (see below), whose sum is σ = 2137380. Its totient is φ = 610676.

The previous prime is 1221299. The next prime is 1221373. The reversal of 1221356 is 6531221.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152666 + ... + 152673.

It is an arithmetic number, because the mean of its divisors is an integer number (356230).

2^1221356 is an apocalyptic number.

It is an amenable number.

1221356 is a deficient number, since it is larger than the sum of its proper divisors (916024).

1221356 is a wasteful number, since it uses less digits than its factorization.

1221356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305343 (or 305341 counting only the distinct ones).

The product of its digits is 360, while the sum is 20.

The square root of 1221356 is about 1105.1497636067. The cubic root of 1221356 is about 106.8925465075.

Adding to 1221356 its reverse (6531221), we get a palindrome (7752577).

The spelling of 1221356 in words is "one million, two hundred twenty-one thousand, three hundred fifty-six".