11157021 has 20 divisors (see below), whose sum is σ = 16780764. Its totient is φ = 7387200.

The previous prime is 11156989. The next prime is 11157053. The reversal of 11157021 is 12075111.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (11156989) and next prime (11157053).

It can be written as a sum of positive squares in 2 ways, for example, as 68121 + 11088900 = 261^2 + 3330^2 .

It is not a de Polignac number, because 11157021 - 2⁵ = 11156989 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11156985 and 11157003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11157061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14281 + ... + 15041.

Almost surely, 2^11157021 is an apocalyptic number.

It is an amenable number.

11157021 is a deficient number, since it is larger than the sum of its proper divisors (5623743).

11157021 is an equidigital number, since it uses as much as digits as its factorization.

11157021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 954 (or 945 counting only the distinct ones).

The product of its (nonzero) digits is 70, while the sum is 18.

The square root of 11157021 is about 3340.2127177771. The cubic root of 11157021 is about 223.4512302939.

The spelling of 11157021 in words is "eleven million, one hundred fifty-seven thousand, twenty-one".