21168011 has 8 divisors (see below), whose sum is σ = 21562848. Its totient is φ = 20776000.

The previous prime is 21167989. The next prime is 21168023. The reversal of 21168011 is 11086112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21168011 - 2¹⁰ = 21166987 is a prime.

It is a super-2 number, since 2×21168011² = 896169379392242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21168031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19421 + ... + 20481.

It is an arithmetic number, because the mean of its divisors is an integer number (2695356).

Almost surely, 2^21168011 is an apocalyptic number.

21168011 is a deficient number, since it is larger than the sum of its proper divisors (394837).

21168011 is a wasteful number, since it uses less digits than its factorization.

21168011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1413.

The product of its (nonzero) digits is 96, while the sum is 20.

The square root of 21168011 is about 4600.8706784695. The cubic root of 21168011 is about 276.6262254400.

The spelling of 21168011 in words is "twenty-one million, one hundred sixty-eight thousand, eleven".