21446011 has 4 divisors (see below), whose sum is σ = 21555072. Its totient is φ = 21336952.

The previous prime is 21445981. The next prime is 21446039. The reversal of 21446011 is 11064412.

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

It is a cyclic number.

It is not a de Polignac number, because 21446011 - 2¹⁵ = 21413243 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 21446011.

It is not an unprimeable number, because it can be changed into a prime (21446071) 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, 54235 + ... + 54628.

It is an arithmetic number, because the mean of its divisors is an integer number (5388768).

Almost surely, 2^21446011 is an apocalyptic number.

21446011 is a deficient number, since it is larger than the sum of its proper divisors (109061).

21446011 is a wasteful number, since it uses less digits than its factorization.

21446011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109060.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 21446011 is about 4630.9838047655. The cubic root of 21446011 is about 277.8319421429.

It can be divided in two parts, 214 and 46011, that added together give a square (46225 = 215²).

The spelling of 21446011 in words is "twenty-one million, four hundred forty-six thousand, eleven".