1001221222220 has 96 divisors (see below), whose sum is σ = 2125089727488. Its totient is φ = 396226095872.

The previous prime is 1001221222207. The next prime is 1001221222229. The reversal of 1001221222220 is 222221221001.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1001221222229) 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, 1018535849 + ... + 1018536831.

It is an arithmetic number, because the mean of its divisors is an integer number (22136351328).

Almost surely, 2^{1001221222220} is an apocalyptic number.

1001221222220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001221222220 is an abundant number, since it is smaller than the sum of its proper divisors (1123868505268).

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

1001221222220 is a wasteful number, since it uses less digits than its factorization.

1001221222220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2279 (or 2277 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1001221222220 its reverse (222221221001), we get a palindrome (1223442443221).

The spelling of 1001221222220 in words is "one trillion, one billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty".