1221320202 has 32 divisors (see below), whose sum is σ = 2465042112. Its totient is φ = 403384704.

The previous prime is 1221320197. The next prime is 1221320227. The reversal of 1221320202 is 2020231221.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 601513 + ... + 603539.

It is an arithmetic number, because the mean of its divisors is an integer number (77032566).

Almost surely, 2^1221320202 is an apocalyptic number.

1221320202 is an abundant number, since it is smaller than the sum of its proper divisors (1243721910).

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

1221320202 is a wasteful number, since it uses less digits than its factorization.

1221320202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2902.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 1221320202 is about 34947.3919198558. The cubic root of 1221320202 is about 1068.9150215550.

Adding to 1221320202 its reverse (2020231221), we get a palindrome (3241551423).

The spelling of 1221320202 in words is "one billion, two hundred twenty-one million, three hundred twenty thousand, two hundred two".