2001221222 has 32 divisors (see below), whose sum is σ = 4030435584. Its totient is φ = 719719200.

The previous prime is 2001221203. The next prime is 2001221239. The reversal of 2001221222 is 2221221002.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 2001221197 and 2001221206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 497804 + ... + 501807.

It is an arithmetic number, because the mean of its divisors is an integer number (125951112).

Almost surely, 2^2001221222 is an apocalyptic number.

2001221222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

2001221222 is an abundant number, since it is smaller than the sum of its proper divisors (2029214362).

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

2001221222 is a wasteful number, since it uses less digits than its factorization.

2001221222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999644.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 2001221222 is about 44735.0111433986. The cubic root of 2001221222 is about 1260.1774382682.

Adding to 2001221222 its reverse (2221221002), we get a palindrome (4222442224).

The spelling of 2001221222 in words is "two billion, one million, two hundred twenty-one thousand, two hundred twenty-two".