201221111210120 has 32 divisors (see below), whose sum is σ = 452782197351000. Its totient is φ = 80482276105728.

The previous prime is 201221111210083. The next prime is 201221111210143. The reversal of 201221111210120 is 21012111122102.

It can be written as a sum of positive squares in 4 ways, for example, as 200856751691236 + 364359518884 = 14172394^2 + 603622^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192233339 + ... + 193277258.

Almost surely, 2^{201221111210120} is an apocalyptic number.

201221111210120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201221111210120 is an abundant number, since it is smaller than the sum of its proper divisors (251561086140880).

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

201221111210120 is a wasteful number, since it uses less digits than its factorization.

201221111210120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385523657 (or 385523653 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 201221111210120 its reverse (21012111122102), we get a palindrome (222233222332222).

The spelling of 201221111210120 in words is "two hundred one trillion, two hundred twenty-one billion, one hundred eleven million, two hundred ten thousand, one hundred twenty".