1213200120 has 128 divisors (see below), whose sum is σ = 3979031040. Its totient is φ = 293475840.

The previous prime is 1213200083. The next prime is 1213200137. The reversal of 1213200120 is 210023121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1213200096 and 1213200105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 980142 + ... + 981378.

It is an arithmetic number, because the mean of its divisors is an integer number (31086180).

Almost surely, 2^1213200120 is an apocalyptic number.

1213200120 is a gapful number since it is divisible by the number (10) 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 1213200120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1989515520).

1213200120 is an abundant number, since it is smaller than the sum of its proper divisors (2765830920).

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

1213200120 is a wasteful number, since it uses less digits than its factorization.

1213200120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2005 (or 2001 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1213200120 is about 34831.0223794823. The cubic root of 1213200120 is about 1066.5408189201.

Adding to 1213200120 its reverse (210023121), we get a palindrome (1423223241).

The spelling of 1213200120 in words is "one billion, two hundred thirteen million, two hundred thousand, one hundred twenty".