1221001202 has 4 divisors (see below), whose sum is σ = 1831501806. Its totient is φ = 610500600.

The previous prime is 1221001189. The next prime is 1221001261. The reversal of 1221001202 is 2021001221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1081028641 + 139972561 = 32879^2 + 11831^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305250299 + ... + 305250302.

Almost surely, 2^1221001202 is an apocalyptic number.

1221001202 is a deficient number, since it is larger than the sum of its proper divisors (610500604).

1221001202 is an equidigital number, since it uses as much as digits as its factorization.

1221001202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610500603.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1221001202 is about 34942.8276188405. The cubic root of 1221001202 is about 1068.8219491614.

Adding to 1221001202 its reverse (2021001221), we get a palindrome (3242002423).

The spelling of 1221001202 in words is "one billion, two hundred twenty-one million, one thousand, two hundred two".