201221111010 has 32 divisors (see below), whose sum is σ = 508348071360. Its totient is φ = 50834806848.

The previous prime is 201221110969. The next prime is 201221111033. The reversal of 201221111010 is 10111122102.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 176509177 + ... + 176510316.

It is an arithmetic number, because the mean of its divisors is an integer number (15885877230).

Almost surely, 2^201221111010 is an apocalyptic number.

201221111010 is an abundant number, since it is smaller than the sum of its proper divisors (307126960350).

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

201221111010 is a wasteful number, since it uses less digits than its factorization.

201221111010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353019522.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 201221111010 its reverse (10111122102), we get a palindrome (211332233112).

The spelling of 201221111010 in words is "two hundred one billion, two hundred twenty-one million, one hundred eleven thousand, ten".