1213323120 has 60 divisors (see below), whose sum is σ = 4074745896. Its totient is φ = 323552640.

The previous prime is 1213323113. The next prime is 1213323143. The reversal of 1213323120 is 213233121.

1213323120 is a `hidden beast` number, since 1 + 21 + 332 + 312 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1213323093 and 1213323102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 841866 + ... + 843305.

Almost surely, 2^1213323120 is an apocalyptic number.

1213323120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213323120 is an abundant number, since it is smaller than the sum of its proper divisors (2861422776).

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

1213323120 is a wasteful number, since it uses less digits than its factorization.

1213323120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1685190 (or 1685181 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1213323120 is about 34832.7880021109. The cubic root of 1213323120 is about 1066.5768613629.

Adding to 1213323120 its reverse (213233121), we get a palindrome (1426556241).

It can be divided in two parts, 12133 and 23120, that added together give a palindrome (35253).

The spelling of 1213323120 in words is "one billion, two hundred thirteen million, three hundred twenty-three thousand, one hundred twenty".