1201220120 has 32 divisors (see below), whose sum is σ = 2720898000. Its totient is φ = 477260928.

The previous prime is 1201220087. The next prime is 1201220129. The reversal of 1201220120 is 210221021.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201220129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94814 + ... + 106733.

Almost surely, 2^1201220120 is an apocalyptic number.

1201220120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201220120 is an abundant number, since it is smaller than the sum of its proper divisors (1519677880).

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

1201220120 is a wasteful number, since it uses less digits than its factorization.

1201220120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201707 (or 201703 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1201220120 is about 34658.6225923651. The cubic root of 1201220120 is about 1063.0186057895.

Adding to 1201220120 its reverse (210221021), we get a palindrome (1411441141).

Subtracting from 1201220120 its reverse (210221021), we obtain a palindrome (990999099).

The spelling of 1201220120 in words is "one billion, two hundred one million, two hundred twenty thousand, one hundred twenty".