2111221000 has 128 divisors (see below), whose sum is σ = 5699865600. Its totient is φ = 716947200.

The previous prime is 2111220977. The next prime is 2111221003. The reversal of 2111221000 is 1221112.

It is a super-2 number, since 2×2111221000² = 8914508221682000000, which contains 22 as substring.

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 (2111221003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 761617 + ... + 764383.

It is an arithmetic number, because the mean of its divisors is an integer number (44530200).

Almost surely, 2^2111221000 is an apocalyptic number.

2111221000 is a gapful number since it is divisible by the number (20) 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 2111221000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2849932800).

2111221000 is an abundant number, since it is smaller than the sum of its proper divisors (3588644600).

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

2111221000 is a wasteful number, since it uses less digits than its factorization.

2111221000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2904 (or 2890 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 2111221000 is about 45948.0249847586. The cubic root of 2111221000 is about 1282.8559683296.

Adding to 2111221000 its reverse (1221112), we get a palindrome (2112442112).

The spelling of 2111221000 in words is "two billion, one hundred eleven million, two hundred twenty-one thousand".