201231220110 has 32 divisors (see below), whose sum is σ = 499608548640. Its totient is φ = 51811256448.

The previous prime is 201231220103. The next prime is 201231220129. The reversal of 201231220110 is 11022132102.

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 201231220110.

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, 115649257 + ... + 115650996.

It is an arithmetic number, because the mean of its divisors is an integer number (15612767145).

Almost surely, 2^201231220110 is an apocalyptic number.

201231220110 is an abundant number, since it is smaller than the sum of its proper divisors (298377328530).

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

201231220110 is a wasteful number, since it uses less digits than its factorization.

201231220110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231300292.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 201231220110 its reverse (11022132102), we get a palindrome (212253352212).

The spelling of 201231220110 in words is "two hundred one billion, two hundred thirty-one million, two hundred twenty thousand, one hundred ten".