221021100010 has 16 divisors (see below), whose sum is σ = 397863881856. Its totient is φ = 88402684048.

The previous prime is 221021099951. The next prime is 221021100011. The reversal of 221021100010 is 10001120122.

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

It is a self number, because there is not a number n which added to its sum of digits gives 221021100010.

It is not an unprimeable number, because it can be changed into a prime (221021100011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 556462 + ... + 867001.

It is an arithmetic number, because the mean of its divisors is an integer number (24866492616).

Almost surely, 2^221021100010 is an apocalyptic number.

221021100010 is a deficient number, since it is larger than the sum of its proper divisors (176842781846).

221021100010 is a wasteful number, since it uses less digits than its factorization.

221021100010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1438997.

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

Adding to 221021100010 its reverse (10001120122), we get a palindrome (231022220132).

The spelling of 221021100010 in words is "two hundred twenty-one billion, twenty-one million, one hundred thousand, ten".