1302221220 has 144 divisors (see below), whose sum is σ = 3824428608. Its totient is φ = 331036160.

The previous prime is 1302221203. The next prime is 1302221237. The reversal of 1302221220 is 221222031.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1302221203) and next prime (1302221237).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1302221220.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6610162 + ... + 6610358.

It is an arithmetic number, because the mean of its divisors is an integer number (26558532).

Almost surely, 2^1302221220 is an apocalyptic number.

1302221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1302221220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1912214304).

1302221220 is an abundant number, since it is smaller than the sum of its proper divisors (2522207388).

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

1302221220 is a wasteful number, since it uses less digits than its factorization.

1302221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398 (or 367 counting only the distinct ones).

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

The square root of 1302221220 is about 36086.3023874711. The cubic root of 1302221220 is about 1092.0141251913.

Adding to 1302221220 its reverse (221222031), we get a palindrome (1523443251).

The spelling of 1302221220 in words is "one billion, three hundred two million, two hundred twenty-one thousand, two hundred twenty".