201221020120 has 32 divisors (see below), whose sum is σ = 458202089520. Its totient is φ = 79518666880.

The previous prime is 201221020103. The next prime is 201221020141. The reversal of 201221020120 is 21020122102.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 201221020120.

It is a congruent number.

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, 30301051 + ... + 30307690.

Almost surely, 2^201221020120 is an apocalyptic number.

201221020120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201221020120 is an abundant number, since it is smaller than the sum of its proper divisors (256981069400).

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

201221020120 is a wasteful number, since it uses less digits than its factorization.

201221020120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60608835 (or 60608831 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 201221020120 its reverse (21020122102), we get a palindrome (222241142222).

The spelling of 201221020120 in words is "two hundred one billion, two hundred twenty-one million, twenty thousand, one hundred twenty".