1216046044721 has 8 divisors (see below), whose sum is σ = 1241285880744. Its totient is φ = 1190977326720.

The previous prime is 1216046044711. The next prime is 1216046044723. The reversal of 1216046044721 is 1274406406121.

It can be written as a sum of positive squares in 4 ways, for example, as 67151466496 + 1148894578225 = 259136^2 + 1071865^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1216046044721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216046044723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42765146 + ... + 42793571.

It is an arithmetic number, because the mean of its divisors is an integer number (155160735093).

Almost surely, 2^{1216046044721} is an apocalyptic number.

It is an amenable number.

1216046044721 is a deficient number, since it is larger than the sum of its proper divisors (25239836023).

1216046044721 is an equidigital number, since it uses as much as digits as its factorization.

1216046044721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85559011.

The product of its (nonzero) digits is 64512, while the sum is 38.

The spelling of 1216046044721 in words is "one trillion, two hundred sixteen billion, forty-six million, forty-four thousand, seven hundred twenty-one".