1213118136720 has 800 divisors, whose sum is σ = 4981285748736. Its totient is φ = 267761894400.

The previous prime is 1213118136707. The next prime is 1213118136731. The reversal of 1213118136720 is 276318113121.

1213118136720 is a `hidden beast` number, since 1 + 213 + 1 + 1 + 81 + 367 + 2 + 0 = 666.

It is a super-2 number, since 2×1213118136720² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 1281011287 + ... + 1281012233.

Almost surely, 2^{1213118136720} is an apocalyptic number.

1213118136720 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 1213118136720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2490642874368).

1213118136720 is an abundant number, since it is smaller than the sum of its proper divisors (3768167612016).

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

1213118136720 is a wasteful number, since it uses less digits than its factorization.

1213118136720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1921 (or 1906 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The spelling of 1213118136720 in words is "one trillion, two hundred thirteen billion, one hundred eighteen million, one hundred thirty-six thousand, seven hundred twenty".