11348721681 has 32 divisors (see below), whose sum is σ = 16758890496. Its totient is φ = 6773880000.

The previous prime is 11348721563. The next prime is 11348721689. The reversal of 11348721681 is 18612784311.

It is not a de Polignac number, because 11348721681 - 2¹¹ = 11348719633 is a prime.

It is a super-2 number, since 2×11348721681² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11348721689) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 627690 + ... + 645516.

It is an arithmetic number, because the mean of its divisors is an integer number (523715328).

Almost surely, 2^11348721681 is an apocalyptic number.

11348721681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11348721681 is a deficient number, since it is larger than the sum of its proper divisors (5410168815).

11348721681 is a wasteful number, since it uses less digits than its factorization.

11348721681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18133.

The product of its digits is 64512, while the sum is 42.

The spelling of 11348721681 in words is "eleven billion, three hundred forty-eight million, seven hundred twenty-one thousand, six hundred eighty-one".