201221311110 has 32 divisors (see below), whose sum is σ = 483100150752. Its totient is φ = 53640238080.

The previous prime is 201221311103. The next prime is 201221311183. The reversal of 201221311110 is 11113122102.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 201221311110.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1086379 + ... + 1258038.

It is an arithmetic number, because the mean of its divisors is an integer number (15096879711).

Almost surely, 2^201221311110 is an apocalyptic number.

201221311110 is an abundant number, since it is smaller than the sum of its proper divisors (281878839642).

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

201221311110 is a wasteful number, since it uses less digits than its factorization.

201221311110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2347288.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 201221311110 its reverse (11113122102), we get a palindrome (212334433212).

The spelling of 201221311110 in words is "two hundred one billion, two hundred twenty-one million, three hundred eleven thousand, one hundred ten".