1211732735472 has 480 divisors, whose sum is σ = 4018185819648. Its totient is φ = 333776830464.

The previous prime is 1211732735459. The next prime is 1211732735491. The reversal of 1211732735472 is 2745372371121.

1211732735472 is a `hidden beast` number, since 1 + 2 + 1 + 1 + 7 + 32 + 73 + 547 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 633419188 + ... + 633421100.

Almost surely, 2^{1211732735472} is an apocalyptic number.

1211732735472 is a gapful number since it is divisible by the number (12) 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 1211732735472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2009092909824).

1211732735472 is an abundant number, since it is smaller than the sum of its proper divisors (2806453084176).

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

1211732735472 is a wasteful number, since it uses less digits than its factorization.

1211732735472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2197 (or 2188 counting only the distinct ones).

The product of its digits is 493920, while the sum is 45.

The spelling of 1211732735472 in words is "one trillion, two hundred eleven billion, seven hundred thirty-two million, seven hundred thirty-five thousand, four hundred seventy-two".