11721735412 has 6 divisors (see below), whose sum is σ = 20513036978. Its totient is φ = 5860867704.

The previous prime is 11721735409. The next prime is 11721735419. The reversal of 11721735412 is 21453712711.

It can be written as a sum of positive squares in only one way, i.e., 8978699536 + 2743035876 = 94756^2 + 52374^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11721735419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1465216923 + ... + 1465216930.

Almost surely, 2^11721735412 is an apocalyptic number.

It is an amenable number.

11721735412 is a deficient number, since it is larger than the sum of its proper divisors (8791301566).

11721735412 is a wasteful number, since it uses less digits than its factorization.

11721735412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2930433857 (or 2930433855 counting only the distinct ones).

The product of its digits is 11760, while the sum is 34.

The spelling of 11721735412 in words is "eleven billion, seven hundred twenty-one million, seven hundred thirty-five thousand, four hundred twelve".