221121201210 has 192 divisors, whose sum is σ = 682795346688. Its totient is φ = 44625411072.

The previous prime is 221121201209. The next prime is 221121201247. The reversal of 221121201210 is 12102121122.

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

It is a self number, because there is not a number n which added to its sum of digits gives 221121201210.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1367614 + ... + 1520726.

It is an arithmetic number, because the mean of its divisors is an integer number (3556225764).

Almost surely, 2^221121201210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221121201210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (341397673344).

221121201210 is an abundant number, since it is smaller than the sum of its proper divisors (461674145478).

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

221121201210 is a wasteful number, since it uses less digits than its factorization.

221121201210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153189 (or 153166 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221121201210 its reverse (12102121122), we get a palindrome (233223322332).

The spelling of 221121201210 in words is "two hundred twenty-one billion, one hundred twenty-one million, two hundred one thousand, two hundred ten".