11181221951 has 8 divisors (see below), whose sum is σ = 11233102608. Its totient is φ = 11129400000.

The previous prime is 11181221917. The next prime is 11181221999. The reversal of 11181221951 is 15912218111.

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 11181221951 - 2¹⁸ = 11180959807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11181221551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 393131 + ... + 420611.

It is an arithmetic number, because the mean of its divisors is an integer number (1404137826).

Almost surely, 2^11181221951 is an apocalyptic number.

11181221951 is a deficient number, since it is larger than the sum of its proper divisors (51880657).

11181221951 is a wasteful number, since it uses less digits than its factorization.

11181221951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29353.

The product of its digits is 1440, while the sum is 32.

The spelling of 11181221951 in words is "eleven billion, one hundred eighty-one million, two hundred twenty-one thousand, nine hundred fifty-one".