11221212001000 has 32 divisors (see below), whose sum is σ = 26257636084680. Its totient is φ = 4488484800000.

The previous prime is 11221212000989. The next prime is 11221212001007. The reversal of 11221212001000 is 10021212211.

It can be written as a sum of positive squares in 4 ways, for example, as 4937737298404 + 6283474702596 = 2222102^2 + 2506686^2 .

It is not an unprimeable number, because it can be changed into a prime (11221212001007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5610605001 + ... + 5610607000.

Almost surely, 2^{11221212001000} is an apocalyptic number.

11221212001000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11221212001000 is an abundant number, since it is smaller than the sum of its proper divisors (15036424083680).

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

11221212001000 is a wasteful number, since it uses less digits than its factorization.

11221212001000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11221212022 (or 11221212008 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 11221212001000 its reverse (10021212211), we get a palindrome (11231233213211).

The spelling of 11221212001000 in words is "eleven trillion, two hundred twenty-one billion, two hundred twelve million, one thousand".