1221320002 has 12 divisors (see below), whose sum is σ = 2131078950. Its totient is φ = 523422816.

The previous prime is 1221319999. The next prime is 1221320021. The reversal of 1221320002 is 2000231221.

It can be written as a sum of positive squares in only one way, i.e., 877996161 + 343323841 = 29631^2 + 18529^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6231127 + ... + 6231322.

Almost surely, 2^1221320002 is an apocalyptic number.

1221320002 is a deficient number, since it is larger than the sum of its proper divisors (909758948).

1221320002 is a wasteful number, since it uses less digits than its factorization.

1221320002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12462465 (or 12462458 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1221320002 is about 34947.3890584118. The cubic root of 1221320002 is about 1068.9149632075.

Adding to 1221320002 its reverse (2000231221), we get a palindrome (3221551223).

The spelling of 1221320002 in words is "one billion, two hundred twenty-one million, three hundred twenty thousand, two".