2221021000 has 64 divisors (see below), whose sum is σ = 5669688960. Its totient is φ = 807640000.

The previous prime is 2221020983. The next prime is 2221021001. The reversal of 2221021000 is 1201222.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (2221021001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89956 + ... + 111955.

It is an arithmetic number, because the mean of its divisors is an integer number (88588890).

Almost surely, 2^2221021000 is an apocalyptic number.

2221021000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2221021000 is an abundant number, since it is smaller than the sum of its proper divisors (3448667960).

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

2221021000 is a wasteful number, since it uses less digits than its factorization.

2221021000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201943 (or 201929 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2221021000 is about 47127.7094711805. The cubic root of 2221021000 is about 1304.7207067098.

Adding to 2221021000 its reverse (1201222), we get a palindrome (2222222222).

The spelling of 2221021000 in words is "two billion, two hundred twenty-one million, twenty-one thousand".