221121020000 has 60 divisors (see below), whose sum is σ = 543990926556. Its totient is φ = 88448400000.

The previous prime is 221121019997. The next prime is 221121020009. The reversal of 221121020000 is 20121122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121020009) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5508026 + ... + 5548025.

Almost surely, 2^221121020000 is an apocalyptic number.

221121020000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221121020000 is an abundant number, since it is smaller than the sum of its proper divisors (322869906556).

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

221121020000 is an equidigital number, since it uses as much as digits as its factorization.

221121020000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11056081 (or 11056058 counting only the distinct ones).

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

Adding to 221121020000 its reverse (20121122), we get a palindrome (221141141122).

The spelling of 221121020000 in words is "two hundred twenty-one billion, one hundred twenty-one million, twenty thousand".