1221311202 has 8 divisors (see below), whose sum is σ = 2442622416. Its totient is φ = 407103732.

The previous prime is 1221311159. The next prime is 1221311209. The reversal of 1221311202 is 2021131221.

It is a sphenic number, since it is the product of 3 distinct primes.

1221311202 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (1221311209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101775928 + ... + 101775939.

It is an arithmetic number, because the mean of its divisors is an integer number (305327802).

Almost surely, 2^1221311202 is an apocalyptic number.

1221311202 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1221311202 is a wasteful number, since it uses less digits than its factorization.

1221311202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203551872.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1221311202 is about 34947.2631546449. The cubic root of 1221311202 is about 1068.9123959103.

Adding to 1221311202 its reverse (2021131221), we get a palindrome (3242442423).

The spelling of 1221311202 in words is "one billion, two hundred twenty-one million, three hundred eleven thousand, two hundred two".