201210121220 has 96 divisors (see below), whose sum is σ = 464447692800. Its totient is φ = 72881195904.

The previous prime is 201210121219. The next prime is 201210121237. The reversal of 201210121220 is 22121012102.

It is a junction number, because it is equal to n+sod(n) for n = 201210121195 and 201210121204.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13618277 + ... + 13633043.

It is an arithmetic number, because the mean of its divisors is an integer number (4837996800).

Almost surely, 2^201210121220 is an apocalyptic number.

201210121220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201210121220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232223846400).

201210121220 is an abundant number, since it is smaller than the sum of its proper divisors (263237571580).

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

201210121220 is a wasteful number, since it uses less digits than its factorization.

201210121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16377 (or 16375 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 201210121220 its reverse (22121012102), we get a palindrome (223331133322).

The spelling of 201210121220 in words is "two hundred one billion, two hundred ten million, one hundred twenty-one thousand, two hundred twenty".