1221323202 has 96 divisors (see below), whose sum is σ = 2962080576. Its totient is φ = 360547200.

The previous prime is 1221323177. The next prime is 1221323203. The reversal of 1221323202 is 2023231221.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1221323203) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1899093 + ... + 1899735.

It is an arithmetic number, because the mean of its divisors is an integer number (30855006).

Almost surely, 2^1221323202 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221323202, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1481040288).

1221323202 is an abundant number, since it is smaller than the sum of its proper divisors (1740757374).

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

1221323202 is a wasteful number, since it uses less digits than its factorization.

1221323202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 896 (or 893 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1221323202 is about 34947.4348414873. The cubic root of 1221323202 is about 1068.9158967671.

Adding to 1221323202 its reverse (2023231221), we get a palindrome (3244554423).

It can be divided in two parts, 1221 and 323202, that added together give a palindrome (324423).

The spelling of 1221323202 in words is "one billion, two hundred twenty-one million, three hundred twenty-three thousand, two hundred two".