1122221000 has 128 divisors (see below), whose sum is σ = 2802159360. Its totient is φ = 419200000.

The previous prime is 1122220973. The next prime is 1122221039. The reversal of 1122221000 is 1222211.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4266869 + ... + 4267131.

It is an arithmetic number, because the mean of its divisors is an integer number (21891870).

Almost surely, 2^1122221000 is an apocalyptic number.

1122221000 is a gapful number since it is divisible by the number (10) 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 1122221000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1401079680).

1122221000 is an abundant number, since it is smaller than the sum of its proper divisors (1679938360).

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

1122221000 is a wasteful number, since it uses less digits than its factorization.

1122221000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552 (or 538 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1122221000 is about 33499.5671613828. The cubic root of 1122221000 is about 1039.1848271945.

Adding to 1122221000 its reverse (1222211), we get a palindrome (1123443211).

The spelling of 1122221000 in words is "one billion, one hundred twenty-two million, two hundred twenty-one thousand".