11551021 has 4 divisors (see below), whose sum is σ = 11740444. Its totient is φ = 11361600.

The previous prime is 11551013. The next prime is 11551081. The reversal of 11551021 is 12015511.

11551021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5225796 + 6325225 = 2286^2 + 2515^2 .

It is a cyclic number.

It is not a de Polignac number, because 11551021 - 2³ = 11551013 is a prime.

It is a super-2 number, since 2×11551021² = 266852172284882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11550986 and 11551004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11551081) 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, 94620 + ... + 94741.

It is an arithmetic number, because the mean of its divisors is an integer number (2935111).

Almost surely, 2^11551021 is an apocalyptic number.

It is an amenable number.

11551021 is a deficient number, since it is larger than the sum of its proper divisors (189423).

11551021 is an equidigital number, since it uses as much as digits as its factorization.

11551021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189422.

The product of its (nonzero) digits is 50, while the sum is 16.

The square root of 11551021 is about 3398.6793023173. The cubic root of 11551021 is about 226.0511866203.

Adding to 11551021 its reverse (12015511), we get a palindrome (23566532).

The spelling of 11551021 in words is "eleven million, five hundred fifty-one thousand, twenty-one".