11121851 has 4 divisors (see below), whose sum is σ = 11977392. Its totient is φ = 10266312.

The previous prime is 11121841. The next prime is 11121853. The reversal of 11121851 is 15812111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15812111 = 7 ⋅2258873.

It is a cyclic number.

It is not a de Polignac number, because 11121851 - 2¹⁴ = 11105467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11121853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 427751 + ... + 427776.

It is an arithmetic number, because the mean of its divisors is an integer number (2994348).

Almost surely, 2^11121851 is an apocalyptic number.

11121851 is a deficient number, since it is larger than the sum of its proper divisors (855541).

11121851 is an equidigital number, since it uses as much as digits as its factorization.

11121851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855540.

The product of its digits is 80, while the sum is 20.

The square root of 11121851 is about 3334.9439275646. The cubic root of 11121851 is about 223.2161898967.

Adding to 11121851 its reverse (15812111), we get a palindrome (26933962).

The spelling of 11121851 in words is "eleven million, one hundred twenty-one thousand, eight hundred fifty-one".