221231121000 has 256 divisors, whose sum is σ = 709792312320. Its totient is φ = 57335040000.

The previous prime is 221231120989. The next prime is 221231121053. The reversal of 221231121000 is 121132122.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 33329682 + ... + 33336318.

It is an arithmetic number, because the mean of its divisors is an integer number (2772626220).

Almost surely, 2^221231121000 is an apocalyptic number.

221231121000 is a gapful number since it is divisible by the number (20) 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 221231121000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (354896156160).

221231121000 is an abundant number, since it is smaller than the sum of its proper divisors (488561191320).

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

221231121000 is a wasteful number, since it uses less digits than its factorization.

221231121000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6973 (or 6959 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 221231121000 its reverse (121132122), we get a palindrome (221352253122).

The spelling of 221231121000 in words is "two hundred twenty-one billion, two hundred thirty-one million, one hundred twenty-one thousand".