11726200721 has 48 divisors (see below), whose sum is σ = 13667640000. Its totient is φ = 10018391040.

The previous prime is 11726200693. The next prime is 11726200729. The reversal of 11726200721 is 12700262711.

It is a de Polignac number, because none of the positive numbers 2^k-11726200721 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11726200729) 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, 33599255 + ... + 33599603.

It is an arithmetic number, because the mean of its divisors is an integer number (284742500).

Almost surely, 2^11726200721 is an apocalyptic number.

It is an amenable number.

11726200721 is a deficient number, since it is larger than the sum of its proper divisors (1941439279).

11726200721 is a wasteful number, since it uses less digits than its factorization.

11726200721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642 (or 625 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 29.

The spelling of 11726200721 in words is "eleven billion, seven hundred twenty-six million, two hundred thousand, seven hundred twenty-one".