1211938616772 has 96 divisors (see below), whose sum is σ = 3561852963200. Its totient is φ = 353277645696.

The previous prime is 1211938616747. The next prime is 1211938616809. The reversal of 1211938616772 is 2776168391121.

1211938616772 is a `hidden beast` number, since 1 + 2 + 1 + 19 + 3 + 8 + 616 + 7 + 7 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 22689223 + ... + 22742574.

Almost surely, 2^{1211938616772} is an apocalyptic number.

1211938616772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211938616772 is an abundant number, since it is smaller than the sum of its proper divisors (2349914346428).

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

1211938616772 is a wasteful number, since it uses less digits than its factorization.

1211938616772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45431842 (or 45431834 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 54.

The spelling of 1211938616772 in words is "one trillion, two hundred eleven billion, nine hundred thirty-eight million, six hundred sixteen thousand, seven hundred seventy-two".