11157761721 has 8 divisors (see below), whose sum is σ = 14880882240. Its totient is φ = 7436574512.

The previous prime is 11157761669. The next prime is 11157761753. The reversal of 11157761721 is 12716775111.

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

It is a cyclic number.

It is not a de Polignac number, because 11157761721 - 2¹⁹ = 11157237433 is a prime.

It is a super-2 number, since 2×11157761721² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11157761721.

It is not an unprimeable number, because it can be changed into a prime (11157761221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 469806 + ... + 492983.

It is an arithmetic number, because the mean of its divisors is an integer number (1860110280).

Almost surely, 2^11157761721 is an apocalyptic number.

It is an amenable number.

11157761721 is a deficient number, since it is larger than the sum of its proper divisors (3723120519).

11157761721 is an equidigital number, since it uses as much as digits as its factorization.

11157761721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 966655.

The product of its digits is 20580, while the sum is 39.

The spelling of 11157761721 in words is "eleven billion, one hundred fifty-seven million, seven hundred sixty-one thousand, seven hundred twenty-one".