1205312699721 has 48 divisors (see below), whose sum is σ = 1744822371840. Its totient is φ = 739770071040.

The previous prime is 1205312699713. The next prime is 1205312699741. The reversal of 1205312699721 is 1279962135021.

It is not a de Polignac number, because 1205312699721 - 2³ = 1205312699713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1205312699711) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 380343225 + ... + 380346393.

It is an arithmetic number, because the mean of its divisors is an integer number (36350466080).

Almost surely, 2^{1205312699721} is an apocalyptic number.

It is an amenable number.

1205312699721 is a deficient number, since it is larger than the sum of its proper divisors (539509672119).

1205312699721 is a wasteful number, since it uses less digits than its factorization.

1205312699721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4946 (or 4933 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 48.

The spelling of 1205312699721 in words is "one trillion, two hundred five billion, three hundred twelve million, six hundred ninety-nine thousand, seven hundred twenty-one".