221121010000 has 100 divisors (see below), whose sum is σ = 584025102144. Its totient is φ = 80407600000.

The previous prime is 221121009959. The next prime is 221121010001. The reversal of 221121010000 is 10121122.

It is a tau number, because it is divible by the number of its divisors (100).

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121010001) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 895096 + ... + 1115095.

Almost surely, 2^221121010000 is an apocalyptic number.

221121010000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221121010000 is an abundant number, since it is smaller than the sum of its proper divisors (362904092144).

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

221121010000 is a wasteful number, since it uses less digits than its factorization.

221121010000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2010230 (or 2010209 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 221121010000 its reverse (10121122), we get a palindrome (221131131122).

The spelling of 221121010000 in words is "two hundred twenty-one billion, one hundred twenty-one million, ten thousand".