1222011000 has 576 divisors, whose sum is σ = 5118590880. Its totient is φ = 261273600.

The previous prime is 1222010989. The next prime is 1222011013. The reversal of 1222011000 is 1102221.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 7496919 + ... + 7497081.

Almost surely, 2^1222011000 is an apocalyptic number.

1222011000 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 1222011000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2559295440).

1222011000 is an abundant number, since it is smaller than the sum of its proper divisors (3896579880).

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

1222011000 is a wasteful number, since it uses less digits than its factorization.

1222011000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 197 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1222011000 is about 34957.2739211741. The cubic root of 1222011000 is about 1069.1165153112.

Adding to 1222011000 its reverse (1102221), we get a palindrome (1223113221).

It can be divided in two parts, 122201 and 1000, that added together give a square (123201 = 351²).

The spelling of 1222011000 in words is "one billion, two hundred twenty-two million, eleven thousand".