221000010000 has 800 divisors, whose sum is σ = 920405376000. Its totient is φ = 44325120000.

The previous prime is 221000009959. The next prime is 221000010017. The reversal of 221000010000 is 10000122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (6).

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

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 66988351 + ... + 66991649.

It is an arithmetic number, because the mean of its divisors is an integer number (1150506720).

Almost surely, 2^221000010000 is an apocalyptic number.

221000010000 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 221000010000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (460202688000).

221000010000 is an abundant number, since it is smaller than the sum of its proper divisors (699405366000).

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

221000010000 is a wasteful number, since it uses less digits than its factorization.

221000010000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3377 (or 3356 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 6.

Adding to 221000010000 its reverse (10000122), we get a palindrome (221010010122).

The spelling of 221000010000 in words is "two hundred twenty-one billion, ten thousand".