11662021 has 4 divisors (see below), whose sum is σ = 13328032. Its totient is φ = 9996012.

The previous prime is 11662003. The next prime is 11662033. The reversal of 11662021 is 12026611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12026611 = 601 ⋅20011.

It is a cyclic number.

It is not a de Polignac number, because 11662021 - 2⁷ = 11661893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11662021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11662621) 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 3 ways as a sum of consecutive naturals, for example, 832995 + ... + 833008.

It is an arithmetic number, because the mean of its divisors is an integer number (3332008).

Almost surely, 2^11662021 is an apocalyptic number.

It is an amenable number.

11662021 is a deficient number, since it is larger than the sum of its proper divisors (1666011).

11662021 is an equidigital number, since it uses as much as digits as its factorization.

11662021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1666010.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 11662021 is about 3414.9701316410. The cubic root of 11662021 is about 226.7729622075.

Adding to 11662021 its reverse (12026611), we get a palindrome (23688632).

The spelling of 11662021 in words is "eleven million, six hundred sixty-two thousand, twenty-one".