11287212891 has 8 divisors (see below), whose sum is σ = 15053310480. Its totient is φ = 7522961952.

The previous prime is 11287212869. The next prime is 11287212929. The reversal of 11287212891 is 19821278211.

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

It is not a de Polignac number, because 11287212891 - 2¹⁰ = 11287211867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11287212841) 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, 447336 + ... + 471893.

It is an arithmetic number, because the mean of its divisors is an integer number (1881663810).

Almost surely, 2^11287212891 is an apocalyptic number.

11287212891 is a deficient number, since it is larger than the sum of its proper divisors (3766097589).

11287212891 is an equidigital number, since it uses as much as digits as its factorization.

11287212891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923325.

The product of its digits is 32256, while the sum is 42.

The spelling of 11287212891 in words is "eleven billion, two hundred eighty-seven million, two hundred twelve thousand, eight hundred ninety-one".