1222001000 has 64 divisors (see below), whose sum is σ = 3119463360. Its totient is φ = 444360000.

The previous prime is 1222000999. The next prime is 1222001009. The reversal of 1222001000 is 1002221.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is not an unprimeable number, because it can be changed into a prime (1222001009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44546 + ... + 66545.

It is an arithmetic number, because the mean of its divisors is an integer number (48741615).

Almost surely, 2^1222001000 is an apocalyptic number.

1222001000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222001000 is an abundant number, since it is smaller than the sum of its proper divisors (1897462360).

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

1222001000 is a wasteful number, since it uses less digits than its factorization.

1222001000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111123 (or 111109 counting only the distinct ones).

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

The square root of 1222001000 is about 34957.1308891333. The cubic root of 1222001000 is about 1069.1135990270.

Adding to 1222001000 its reverse (1002221), we get a palindrome (1223003221).

The spelling of 1222001000 in words is "one billion, two hundred twenty-two million, one thousand".