21106011 has 8 divisors (see below), whose sum is σ = 28618560. Its totient is φ = 13832072.

The previous prime is 21105977. The next prime is 21106037. The reversal of 21106011 is 11060112.

It is a happy number.

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 21106011 - 2⁹ = 21105499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21106051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59445 + ... + 59798.

It is an arithmetic number, because the mean of its divisors is an integer number (3577320).

Almost surely, 2^21106011 is an apocalyptic number.

21106011 is a deficient number, since it is larger than the sum of its proper divisors (7512549).

21106011 is a wasteful number, since it uses less digits than its factorization.

21106011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119305.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 21106011 is about 4594.1278824169. The cubic root of 21106011 is about 276.3558867372.

Adding to 21106011 its reverse (11060112), we get a palindrome (32166123).

The spelling of 21106011 in words is "twenty-one million, one hundred six thousand, eleven".