1212112453440 has 224 divisors, whose sum is σ = 4437161844480. Its totient is φ = 274602295296.

The previous prime is 1212112453439. The next prime is 1212112453451. The reversal of 1212112453440 is 443542112121.

It is a tau number, because it is divible by the number of its divisors (224).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1212112453398 and 1212112453407.

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, 38755 + ... + 1557474.

Almost surely, 2^{1212112453440} is an apocalyptic number.

1212112453440 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 1212112453440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2218580922240).

1212112453440 is an abundant number, since it is smaller than the sum of its proper divisors (3225049391040).

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

1212112453440 is a wasteful number, since it uses less digits than its factorization.

1212112453440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1596369 (or 1596359 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

Adding to 1212112453440 its reverse (443542112121), we get a palindrome (1655654565561).

The spelling of 1212112453440 in words is "one trillion, two hundred twelve billion, one hundred twelve million, four hundred fifty-three thousand, four hundred forty".