1000221012220 has 24 divisors (see below), whose sum is σ = 2100496303584. Its totient is φ = 400082275776.

The previous prime is 1000221012191. The next prime is 1000221012221. The reversal of 1000221012220 is 222101220001.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1000221012220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000221012221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1094017 + ... + 1788103.

It is an arithmetic number, because the mean of its divisors is an integer number (87520679316).

Almost surely, 2^{1000221012220} is an apocalyptic number.

1000221012220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1000221012220 is an abundant number, since it is smaller than the sum of its proper divisors (1100275291364).

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

1000221012220 is a wasteful number, since it uses less digits than its factorization.

1000221012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766149 (or 766147 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1000221012220 its reverse (222101220001), we get a palindrome (1222322232221).

The spelling of 1000221012220 in words is "one trillion, two hundred twenty-one million, twelve thousand, two hundred twenty".