1220222220 has 96 divisors (see below), whose sum is σ = 4074513408. Its totient is φ = 266779392.

The previous prime is 1220222219. The next prime is 1220222221. The reversal of 1220222220 is 222220221.

It is an interprime number because it is at equal distance from previous prime (1220222219) and next prime (1220222221).

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 1220222220.

It is not an unprimeable number, because it can be changed into a prime (1220222221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53499 + ... + 72818.

It is an arithmetic number, because the mean of its divisors is an integer number (42442848).

Almost surely, 2^1220222220 is an apocalyptic number.

1220222220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220222220 is an abundant number, since it is smaller than the sum of its proper divisors (2854291188).

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

1220222220 is a wasteful number, since it uses less digits than its factorization.

1220222220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126359 (or 126357 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 1220222220 is about 34931.6793183494. The cubic root of 1220222220 is about 1068.5946028978.

Adding to 1220222220 its reverse (222220221), we get a palindrome (1442442441).

The spelling of 1220222220 in words is "one billion, two hundred twenty million, two hundred twenty-two thousand, two hundred twenty".