1221206046 has 16 divisors (see below), whose sum is σ = 2447088384. Its totient is φ = 406289304.

The previous prime is 1221206039. The next prime is 1221206069. The reversal of 1221206046 is 6406021221.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191446 + ... + 197721.

It is an arithmetic number, because the mean of its divisors is an integer number (152943024).

Almost surely, 2^1221206046 is an apocalyptic number.

1221206046 is an abundant number, since it is smaller than the sum of its proper divisors (1225882338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221206046 is a wasteful number, since it uses less digits than its factorization.

1221206046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389695.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 1221206046 is about 34945.7586267633. The cubic root of 1221206046 is about 1068.8817169215.

Adding to 1221206046 its reverse (6406021221), we get a palindrome (7627227267).

The spelling of 1221206046 in words is "one billion, two hundred twenty-one million, two hundred six thousand, forty-six".