1221200002 has 12 divisors (see below), whose sum is σ = 2013466518. Its totient is φ = 555090800.

The previous prime is 1221199963. The next prime is 1221200011. The reversal of 1221200002 is 2000021221.

It can be written as a sum of positive squares in only one way, i.e., 962922961 + 258277041 = 31031^2 + 16071^2 .

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, 2522899 + ... + 2523382.

Almost surely, 2^1221200002 is an apocalyptic number.

1221200002 is a deficient number, since it is larger than the sum of its proper divisors (792266516).

1221200002 is a wasteful number, since it uses less digits than its factorization.

1221200002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5046305 (or 5046294 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 1221200002 is about 34945.6721497813. The cubic root of 1221200002 is about 1068.8799535468.

Adding to 1221200002 its reverse (2000021221), we get a palindrome (3221221223).

It can be divided in two parts, 1221 and 200002, that multiplied together give a palindrome (244202442).

The spelling of 1221200002 in words is "one billion, two hundred twenty-one million, two hundred thousand, two".