1220220000 has 180 divisors, whose sum is σ = 4336752420. Its totient is φ = 325344000.

The previous prime is 1220219971. The next prime is 1220220019. The reversal of 1220220000 is 220221.

It is a tau number, because it is divible by the number of its divisors (180).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 176611 + ... + 183389.

It is an arithmetic number, because the mean of its divisors is an integer number (24093069).

Almost surely, 2^1220220000 is an apocalyptic number.

1220220000 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 1220220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2168376210).

1220220000 is an abundant number, since it is smaller than the sum of its proper divisors (3116532420).

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

1220220000 is an equidigital number, since it uses as much as digits as its factorization.

1220220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6815 (or 6789 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 1220220000 is about 34931.6475420213. The cubic root of 1220220000 is about 1068.5939548515.

Adding to 1220220000 its reverse (220221), we get a palindrome (1220440221).

The spelling of 1220220000 in words is "one billion, two hundred twenty million, two hundred twenty thousand".