11021999 has 4 divisors (see below), whose sum is σ = 11070360. Its totient is φ = 10973640.

The previous prime is 11021993. The next prime is 11022023. The reversal of 11021999 is 99912011.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11021999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11021993) 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, 23837 + ... + 24294.

It is an arithmetic number, because the mean of its divisors is an integer number (2767590).

Almost surely, 2^11021999 is an apocalyptic number.

11021999 is a deficient number, since it is larger than the sum of its proper divisors (48361).

11021999 is an equidigital number, since it uses as much as digits as its factorization.

11021999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48360.

The product of its (nonzero) digits is 1458, while the sum is 32.

The square root of 11021999 is about 3319.9396078845. The cubic root of 11021999 is about 222.5461689321.

The spelling of 11021999 in words is "eleven million, twenty-one thousand, nine hundred ninety-nine".